Road pricing (also road user charges) are direct charges levied for the use of roads, including road tolls, distance or time based fees, congestion charges and charges designed to discourage use of certain classes of vehicle, fuel sources or more polluting vehicles. These charges may be used primarily for revenue generation, usually for road infrastructure financing, or as a transportation demand management tool to reduce peak hour travel and the associated traffic congestion or other social and environmental negative externalities associated with road travel such as air pollution, greenhouse gas emissions, visual intrusion, noise and road accidents.
In most countries toll roads, toll bridges and toll tunnels are often used primarily for revenue generation to repay for long-term debt issued to finance the toll facility, or to finance capacity expansion, operations and maintenance of the facility itself, or simply as general tax funds. Road congestion pricing for entering an urban area, or pollution charges levied vehicles with higher tailpipe emissions are typical schemes implemented to price externalities. The application of congestion charges is currently limited to a small number of cities and urban roads, and the notable schemes include the Electronic Road Pricing in Singapore, the London congestion charge, the Stockholm congestion tax, the Milan Area C, and high-occupancy toll lanes in the United States. Examples of pollution pricing schemes include the London low emission zone and the discontinued Ecopass in Milan. Mileage based usage fees (MBUF) or distance based charging has been implemented for heavy vehicles based on truck weight and distance traveled in New Zealand (called RUC), Switzerland (LSVA), Germany (LKW-Maut), Austria (Go-Maut), Czech Republic, Slovakia, Poland, and in four US states: Oregon, New York, Kentucky and New Mexico.
Many recent road pricing schemes have proved controversial with a number of high profile schemes in the US and the UK being cancelled, delayed or scaled back in response to opposition and protest. Critics maintain that congestion pricing is not equitable, places an economic burden on neighboring communities, has a negative effect on retail businesses and on economic activity in general, and is just another tax. A 2006 survey of economic literature on the subject, however, finds that most economists agree that some form of road pricing to reduce congestion is economically viable, although there is disagreement on what form road pricing should take. Economists disagree over how to set tolls, how to cover common costs, what to do with any excess revenues, whether and how “losers” from tolling previously free roads should be compensated, and whether to privatize highways.
- 1 Terminology
- 2 History
- 3 Example schemes
- 3.1 Australasia
- 3.2 Europe
- 3.3 Middle east
- 3.4 North America
- 3.5 South America
- 4 See also
- 5 References
- 6 Bibliography
- 7 External links
Road pricing is a general term which may be used for any system where the driver pays directly for use of a particular roadway or road network in a particular city, region or nation. Road pricing also includes congestion charging, which are charges levied on qualifying road users to reduce peak demand, and thereby reduce traffic congestion and also to place a charge on road users for other negative externalities, including traffic accidents, noise, air pollution, and greenhouse gas emissions.
The first published reference to 'road pricing' was possibly in 1949 when the RAND Corporation proposed "use of direct road pricing to make freight journeys more expensive on congested routes or to influence the time of day at which freight traffic operates". Nobel-laureate William Vickrey then built on the ideas of the economist Arthur Pigou, outlining a theoretical case for road pricing in a major work on the subject of 1955 proposing in 1959 that drivers should be charged by electronic means for use of busy urban roads. Arthur Pigou had previously developed the concept of economic externalities in a publication of 1920 in which he proposed that what is now referred to as a Pigouvian tax equal to the negative externality should be used to bring the outcome within a market economy back to economic efficiency.
In 1963 Vickery published a paper 'Pricing in urban and suburban transport’ in the American Economic Review and Gabriel Joseph Roth, John Michael Thomson of the Department of Applied Economics at the University of Cambridge published a short paper titled "Road pricing, a cure for congestion?". The Smeed Report, 'Road Pricing: The Economic and Technical Possibilities' which had been commissioned in 1962 by the United Kingdom Ministry of Transport was published in 1964. Road pricing was then developed by Maurice Allais and Gabriel Roth in a paper titled "The Economics of Road User Charges" published by the World Bank in 1968.
The first successful implementation of a congestion charge was with the Singapore Area Licensing Scheme in 1976. The Electronic Road Pricing (Hong Kong) scheme operated as a trial between 1983 and 1985 but was not continued permanently due to public opposition. A number of road tolling schemes were then introduced in Norway between 1986 and 1991 in Bergen, Oslo and the Trondheim Toll Scheme. It was noticed that the Oslo scheme had the unintended effect of reducing traffic by around 5%. The Singapore scheme was expanded in 1995 and converted to use a new electronic tolling system in 1998 and renamed Electronic Road Pricing. The first use of a road toll for access by low-occupancy vehicles to high-occupancy vehicle lane was introduced in the U.S. on California State Route 91 in 1995. Since 2000, other schemes have been introduced, although the New York congestion pricing proposal and a number of UK proposals were not progressed due to public opposition.
In January 2009, variable tolls were implemented at Sydney Harbour Bridge, two weeks after upgrading to 100% free-flow electronic toll collection. The highest fees are charged during the morning and afternoon peak periods; a toll 25% lower applies for the shoulder periods; and a toll lower than the previously existing is charged at nights, weekends, and public holidays. This is Australia's first road congestion pricing scheme, and has had only a very minor effect on traffic levels, reducing them by 0.19% 
Main roadways and highways in Shanghai are tolled, and an assessment was completed to evaluate implementation of congestion pricing for vehicles entering the central business district. The city also restrains car use, ownership and there are restrictions on getting a driver's license; since 1998, the number of new car registrations is limited to 50,000 vehicles a year and car registrations are sold by public auction, with prices reaching up to US$5,000 in 2006. Parking is also limited.
Congestion based pricing for Beijing was recommended by the World Bank in 2010 and local officials announced plans to introduce a scheme in September 2011 although no details about the cost or the charge zone have been provided. Currently the city is dealing with traffic congestion and air pollution through a road space rationing scheme implemented since the 2008 Summer Olympics.
In early 2010 the city Guangzhou, Guangdong province, opened a public discussion on whether to introduce congestion charges. An online survey conducted by two local news outlets found that 84.4% of respondents opposed the charges. The city of Nanjing is also considering the implementation of congestion pricing.
Hong Kong's Electronic Road Pricing system operated between 1983 and 1985 with positive results. Public opposition stalled its permanent implementation. Proposals were however raised again in 2012.
The world's first congestion pricing scheme was introduced in Singapore's core central business district in 1975 as the Singapore Area Licensing Scheme. It was extended in 1995 and converted to the 100% free-flowing Electronic Road Pricing (Singapore) in September 1998. Variable pricing based on congestion levels were introduced during 2007. It is one of a number of elements in their Transportation Demand Management, which also includes high annual road tax, custom duties and vehicle registration fees for new vehicles, a quota system for new vehicles and heavy investment in public transportation. Singapore has one of the highest per capita incomes in Asia, but fewer than 30% of Singaporean households own cars.
A distance based charging scheme called Go-Maut was implemented in Austria for all vehicles over 3.5 tonnes on motorways in 2004. In addition, all vehicles under 3.5 tonnes are required to buy a sticker to access the Austrian motorway network, which is owned and operated by a state owned company called ASFINAG. The sticker enables the vehicle to use almost the entire motorway network in Austria for a specific period of time, with the lower charge set at €8 for 10 days. However, for selected routes, such as long tunnels and expensive routes through the Alps, there is an additional toll charge.
The only Finnish town to suffer serious road congestion is Helsinki, which is built on a narrow peninsula. In the 1980s and 1990s the City Administration was already proposing tolls on vehicles entering the centre but these were successfully resisted by the Chamber of Commerce.
Road pricing was taken up in the central government programme in 2011, when the coalition members committed themselves to examining “the introduction of GPS-based road user charges”.  Transport minister Merja Kyllönen set up a working group to study “road user charging systems” in October 2012.  The Ministry was committed to the architecture of the European Electronic Toll Service. 
In March 2013 an independent Finnish policy institute recommended a market-based road pricing architecture for Europe. The roads needed for a journey could be pre-booked, the price of “slots” rising as the roads to be used approached capacity. The price would become payable at the scheduled time of departure unless the slot holder resold the slot before then. Casual motorists without bookings would be charged the current price.  The paper proposed that Finland, having no serious road congestion to address, could serve as a testbed for road charging mechanisms.
The Transport Ministry’s working group reported in December 2013 that a tax proportional to road use would implement transport and environment policies better than current fixed taxes on motoring, although collection costs would be many times higher. The focus of transport policy should be on solving capacity problems by managing demand rather than by building new infrastructure. However, it argued that buses and lorries should be exempted from road use charges on the grounds that the rise in costs could not be offset by cutting other heavy vehicle road taxes, which were already close to the minimum set in the EU’s vignette directive. For private cars the report looked at the implications of fixed and regional kilometre charges but did not consider market or other methods for responding to varying local congestion. Before the adoption of any system, it proposed broad trials to establish the technical viability of taxing road use, its enforceability and the protection of privacy. 
The LKW-MAUT distance based charging scheme large goods vehicles in Germany began operation on 1 January 2005 after a two-year delay with prices varying depending on emission levels and the number of axles. The scheme which combining satellite technology with other technologies and is operated by Toll Collect suffered delays before implementation.
The Milan "Ecopass" system began operation in early 2008 with an objective to reduce air pollution from vehicles. It was extended several times before being replaced by Area C, a conventional congestion pricing scheme covering the same geographic area in January 2012 as an 18-month pilot. Electric vehicles, public utilities' vehicles, police and emergency vehicles, buses and taxis are exempted from the charge. Hybrid electric and bi-fuel natural gas vehicles (CNG and LPG) will be exempted until January 1, 2013.
The scheme was made permanent in March 2013. All net earnings from Area C are invested to promote sustainable mobility and policies to reduce air pollution, including the redevelopment, protection and development of public transport, "soft mobility" (pedestrians, cycling, Zone 30), and systems to rationalize the distribution of goods.
The automated 'Controlled Vehicular Access' (CVA) system was launched in Malta's capital city of Valletta on May 1, 2007. The number of vehicles entering the city reduced from 10,000 to 7,900; there has also been a 60% drop in car stays by non-residents of more than eight hours with a marked increase of 34% in non-residential cars visiting the city for an hour or less.
Norway implemented electronic urban tolling on the main road corridors into Bergen (1986), Oslo (1990) and then the Trondheim Toll Scheme the following year. The Bergen scheme operated as a cordon on all entry points to the central area of the city. The Oslo scheme was initially created as a conventional road toll for revenue generation reasons, but had the unintended effect of reducing traffic by around 5%. Charges vary by time of the day. The legal basis for introducing congestion charging fee was approved by Parliament in 2001 and came into force in October 2011.
The Stockholm congestion tax covering Stockholm City Centre was trialed for seven-month trial during 2006 and has been operational on a permanent basis since August 1, 2007; all the entrances and exits of this area have unmanned control points operating with automatic number plate recognition and most vehicles pay a fixed fee during peak hours.
The Smeed Report recommended the implementation of congestion charging in 1964 and road pricing for London was considered by the Greater London Council in 1973 but was not progressed. The Durham City congestion charge was introduced in 2002 and the London congestion charge in 2003. In June 2005, Transport Secretary Alistair Darling announced the a proposal for a national scheme in which every vehicle would be fitted with a satellite receiver which would calculate charges, with prices (including fuel duty) ranging from 2p per mile on uncongested roads to £1.34 on the most congested roads at peak times. The scheme was dropped after an online petition against proposals gained over 1.8 million signatures. A number of local schemes were then proposed and rejected during 2007-2008, including the Manchester congestion charge Planned emissions based charges in London cancelled following the 2008 Mayoral election. A 'Western Extension' was added to the London scheme in 2007 but then removed in January 2011. The London low emission zone was introduced in stages between 2008 and 2012 with an aim of reducing the pollution emissions of diesel-powered commercial vehicles in London. UK wide road pricing for large goods vehicles, which was first proposed in 2000 before being dropped and then revived in 2012.
Approved by Mayor Boris Johnson in April 2013, the Ultra Low Emission Discount (ULED) went into effect on 1 July 2013, substituting the Greener Vehicle Discount. The ULED introduced more stringent emission standards that limited the free access to the congestion charge zone to electric cars, some plug-in hybrids, and any car or van that emits 75g/km or less of CO2 and meets the Euro 5 emission standards for air quality. The measure was designed to curb the growing number of diesel vehicles on London's roads. The owners of vehicles registered for the Greener Vehicle Discount were granted a three-year sunset period (until June 2016) before they have to pay the full congestion charge.
In March 2001, the Port Authority of New York and New Jersey implemented a discount during off-peak hours for those vehicles paying tolls for several tunnels and bridges connecting New York City and New Jersey using the electronic EZ Pass. Since March 2008, qualified low-emission automobiles could get a 50% discount during off-peak hours.
In April 2007 the New York City Mayor Michael Bloomberg proposed a contentious congestion charge on cars using most streets in the central business district (southern half of Manhattan) as part of the broader PlaNYC 2030. The plan received broad support from a coalition of civic, business, environmental, labor, community and public health organizations and the City Council voted for the measure but also received significant opposition. The New York Legislature declined to vote on it in April 2008 saying that "...the opposition was so overwhelming,...that he would not hold an open vote of the full Assembly,".
In 2006, San Francisco authorities began a feasibility study to evaluate congestion pricing in the city. The initial charging scenarios considered were presented in public meetings held in December 2008 and the final draft proposal were discussed by the San Francisco Board of Supervisors (SFBS) in December 2010 which recommended implementation of a six-month to one-year trial in 2015. Separately, in July 2010 congestion tolls were implemented at the San Francisco-Oakland Bay Bridge.
Other metropolitan areas
In August 2007, the United States Department of Transportation selected five metropolitan areas to initiate congestion pricing demonstration projects under the Urban Partnerships Congestion Initiative, for US$ 1 billion of federal funding. The five projects under this initiative are; Golden Gate Bridge in San Francisco, State Route 520 serving downtown Seattle and communities to its east, Interstate 95 between Miami and Ft. Lauderdale, Interstate 35W serving downtown Minneapolis, and a variable rate parking meter system in Chicago, which replaced New York City after it left the program in 2008.
High occupancy toll (HOT) lanes
The most common application of congestion pricing policies in the U.S. urban transportation context is to toll a single facility (highway or bridge). Tolls for the use of High-occupancy vehicle lanes by low or single-occupancy vehicles were first implemented on California's private toll 91 Express Lanes, in Orange County in 1995, followed in 1996 by Interstate 15 in San Diego.
In January 2012, the federal government of Brazil enacted the Urban Mobility Law that authorizes municipalities to implement congestion pricing to reduce traffic flows. The law also seeks to encourage the use of public transportation and reduce air pollution. According to the law, revenues from congestion charges should be destined exclusively to urban infrastructure for public transportation and non-motorized modes of locomotion (such as walking and cycling), and to finance public subsidies for transit fares. The law went into effect in April 2013.
- São Paulo city
In April 2012, one of the committees of the São Paulo city council approved a bill to introduce a R$4 (~ US$2) per day congestion charge within the same area as the existing road space rationing (Portuguese: Rodízio veicular) by the last digit of the license plate, which has been in force since 1996. The bill still needs approval by two other committees before going for a final vote at the city council.  Opinion surveys have shown that the initiative is highly impopular. A survey by Veja magazine found that 80% of drivers are against congestion pricing, and another survey by Exame magazine found that only 1% of São Paulo's residents support the initiative, while 30% find that extending the metro system is a better solution to reduce traffic congestion. São Paulo's strategic urban development plan "SP 2040", approved in November 2012, proposes the implementation of congestion pricing by 2025, when the density of metro and bus corridors is expected to reach 1.25 km/km2. The Plan also requires ample consultation and even a referendum before beginning implementation.
Congestion pricing has also been implemented in urban freeways. Between 2004 and 2005, Santiago de Chile implemented the first 100% non-stop urban toll for concessioned freeways passing through a downtown area, charging by the distance traveled. Congestion pricing is used since 2007 during rush hours in order to maintain reasonable speeds within the city's core with the aim of keeping a minimum level of service for their customers.
- GNSS road pricing
- List of toll bridges
- List of toll roads
- Road space rationing
- Sustainable transport
- Toll roads around the world
- Vehicle miles traveled tax
- "Road Pricing Defined". Federal Highway Administration.
- Small, Kenneth A.; José A. Gomez-Ibañez (1998). Road Pricing for Congestion Management: The Transition from Theory to Policy. The University of California Transportation Center, University of California at Berkeley. p. 213.
- Paul Johnson, Andrew Leicester and George Stoye (May 2012). "Fuel for Thought – The what, why and how of motoring taxation". Institute for Fiscal Studies and Royal Automobile Club Foundation for Motoring. Retrieved 2012-05-22. Executive Summary, pp. v.
- Small, Kenneth A.; Verhoef, Erik T. (2007). The Economics of Urban Transportation. Routledge, New York. pp. 148–153. ISBN 978-0-415-28515-5.
- "Area C è partita: calate del 40% le auto in centro dopo l'entrata in vigore del pedaggio" [Area C takes off: auto traffic decreased 40% in the center after the toll goes into force]. Corriere della Sera Milano (in Italian). 2012-05-23. Retrieved 2012-01-16.
- Scott Wilson (2012-05-03). "Mileage based usage fees – distance based charging – vehicle mileage tax – a future?". Road Pricing Blog. Retrieved 2013-11-17.
- Lindsey, Robin (May 2006). "Do Economists Reach a Conclusion on Road Pricing? The Intellectual History of an Idea" (PDF). Econ Journal Watch 3 (2): 292–379. Retrieved 2008-12-09.
- "Road Pricing. Congestion Pricing, Value Pricing, Toll Roads and HOT Lanes". Victoria Transport Policy Institute.
- "Road Pricing: The Next Steps". Transport Select Committee.
- "Inquiry into Federal-State Road Funding Arrangements". Parliament of Victoria. p. 143.
- "Glossary terms". Texas Transportation Institute.
- The Rand paper series. RAND Corporation. p. 16. "Potentially more effective in the near term would be the use of direct road pricing to make freight journeys more expensive on congested routes or to influence the time of day at which freight traffic operates"
- "Road Pricing: Lessons from London". "Models of increasing sophistication, which describe congestion have been developed over the years since the seminal work of Vickrey (1955)."
- Gross, Daniel (2007-02-11). "What’s the Toll? It Depends on the Time of Day". New York Times.
- Pigou, A. C. (1920). The Economics of Welfare. London: Macmillan.
- "Comparisons of different implementation procedures of road pricing schemes in two European countries".
- Gabriel Joseph Roth, John Michael Thomson (1963). Road pricing, a cure for congestion?. University of Cambridge.
- R.J.Smeed (1964). Road Pricing: The Economic and Technical Possibilities (Smeed Report). Ministry of Transport.
- Walters, A. A. (1968). The Economics of Road User Charges. World Bank Staff Occasional Papers Number Five, Chapter VII, Washington, D.C. pp. 191–217. ISBN 978-0-8018-0653-7.
- Ieromanachou, Potter and Warren. "Norway's urban toll rings: evolving towards congestion charging?" (PDF).
- "Peak hour toll begins on Harbour Bridge". Yahoo!7 News (Australia). 2009-01-27. Retrieved 2009-03-10.
- Michael Daley (2009-02-05). "Motorists Embrace Cashless Tolling on Sydney Harbour Bridge" (PDF). NSW Minister for Roads. Retrieved 2009-03-10.
- "Harbour congestion tax 'will anger some'". ABC News (Australia). 2009-01-22. Retrieved 2009-03-10.
- Sperling, Daniel and Deborah Gordon (2009). Two billion cars: driving toward sustainability. Oxford University Press, New York. pp. 219–220. ISBN 978-0-19-537664-7. . See on Chapter 8 Stimulating Chinese Innovation.
- Bob McQueen, Tom Biggstitle, and Chris Bausher (2006). "Congestion pricing" (iPaper). ETC, etc (Thinking Highways) I (1): 35–36. Retrieved 2009-02-23. A PDF version of the article is available for download here 
- China Daily (2010-12-21). "Time to fix traffic in Beijing". Xinhuanet. Retrieved 2011-09-07.
- "Will Congestion Pricing Relieve Traffic Jams?". Beijing Review. 2010-05-31. Retrieved 2011-09-07.
- "Beijing 'plans congestion charge' to ease traffic woes". BBC News. 2011-09-02. Retrieved 2011-09-07.
- "Post-Olympics Beijing car restrictions to take effect next month". China View news. 2008-09-28. Retrieved 2009-10-17.
- Michael Wines (2009-10-16). "Beijing's Air Is Cleaner, but Far From Clean". New York Times. Retrieved 2009-10-17.
- Electronic road pricing. Developments in Hong Kong 1983–1986
- "HK news watch". South China Morning Post. 2012-02-27.
- Cervero, Robert (1998). The Transit Metropolis. Island Press, Washington, D.C. p. 169. ISBN 1-55963-591-6. Chapter 6/The Master Planned Transit Metropolis: Singapore.
- Ken Belson (2008-03-16). "Importing a Decongestant for Midtown Streets". New York Times. Retrieved 2008-04-06.
- R. Cervero op. cit. pp. 155
- Singapore Census of Population Office
- Scott Wilson (2012-02-25). "Salzburg seeks vignette exemption for local motorways". Road Pricing Blog. Retrieved 203-11-17.
- "Helsingin kauppakamari: Tietullit olisivat katastrofi (Helsinki Chamber of Commerce: Road tolls would be catastrophic)". Helsingin Sanomat. 18 August 1993.
- "Programme of Prime Minister Jyrki Katainen’s Government". Prime Minister’s Office. 22 June 2011. Retrieved 4 January 2014.
- "Road user charging systems to be explored". press releases. Ministry of Transport and Communications of Finland. 23 October 2012. Retrieved 6 March 2013.
- "The European Electronic Toll Service". European Commission. 16 June 2011. Retrieved 6 March 2013.
- Humphreys, Pat (5 March 2013). "Road Authorities: price or tax?". Nordic Communications Corporation. Retrieved 6 March 2013.
- "Oikeudenmukaista ja älykästä liikennettä, Työryhmän loppuraportti (Fair and intelligent Transport Working Group, Final report)". Ministry of Transport and Communications of Finland. 16 December 2013. Retrieved 4 January 2014.
- Marco Bertacche (2008-01-03). "Milan Introduces Congestion Charge To Cut Pollution". The New York Sun. Retrieved 2008-01-17.
- Ken Belson (2008-01-27). "Toll Discounts for Going Green". The New York Times. Retrieved 2008-01-27.
- BBC News (2008-03-02). "Milan introduces traffic charge". Retrieved 2008-01-17.
- Edoardo Croci (2008-12-31). "Ecopass. Prorogato fino al 31 dicembre 2009. Nei primi mesi dell’anno prevista la consultazione dei cittadini" (in Italian). Comune di Milano. Retrieved 2009-02-14. The complete pricing scheme is presented in this article.
- Comune di Milano (2013-03-17). "Area C. Istituita la congestion charge definitiva" [Area C. The congestion charge was made permanent] (in Italian). Comune di Milano. Retrieved 2013-10-19.
- Controlled Vehicular Access, CVA Technology, May 1, 2007.
- "Valletta traffic congestion considerably reduced". MaltaMedia News. 2007-05-06. Retrieved 2008-07-15.
- European Local Transport Information Service (ELTIS). "Controlled Vehicle Access, Valleta, Malta". Retrieved 2008-04-05.
- Wærsted, Kristian. "Urban Tolling in Norway" (PDF). p. 5.
- "Trängselskatt i Stockholm". Swedish Road Administration. Retrieved 2007-08-01.
- "Odramatisk start för biltullarna". Dagens Nyheter. 2007-08-01. Retrieved 2007-08-01.
- "Tider och belopp". Swedish Road Administration. Retrieved 2007-08-01.
- Tempest, Matthews (2006-08-07). "Q&A: National road charging scheme". The Guardian (London: Guardian News and Media Limited). Retrieved 2007-06-22.
- "Local welcome for congestion charge". BBC News (British Broadcasting Corporation). 2002-10-01. Retrieved 2007-04-27.
- Beard, Matthew (2003-02-17). "Livingstone predicts 'difficult few days' as congestion charge begins". The Independent (London: Independent News and Media Limited). Retrieved 2006-04-09.
- "'Pay-as-you-go' road charge plan". BBC News (British Broadcasting Corporation). 2005-06-06. Retrieved 2007-06-22.
- Tempest, Matthew (2005-06-09). "Darling unveils road charging plans". The Guardian (London: Guardian News and Media Limited). Retrieved 2007-06-22.
- "Feasibility study of road pricing in the UK". Department for Transport. 2004-07-16. pp. para B.52. Archived from the original on 2007-07-17. Retrieved 2007-08-25.
- "Blair's statement in full". BBC News (British Broadcasting Corporation). 2007-02-21. Retrieved 2007-06-22.
- Salter, Alan (2007-05-25). "C-charge details revealed". Manchester Evening News. M.E.N. media 2007. Retrieved 2007-11-25.
- "Mayor quashes £25 C-charge hike". BBC News. 2008-07-08. Retrieved 2008-08-16.
- "Consultation results". Transport for London. Retrieved 6 December 2010.
- "The Low Emission Zone. Cleaner air for Greater London." (PDF). Transport for London. pp. Pages 10–12. Retrieved 2007-11-25.
- "Roads: lorry road user charging". Parliament.
- "Foreign lorries face £10 daily charge on UK roads". BBC News. 2012-01-25. "Foreign lorry drivers could pay as much as £10 a day to use UK roads, the government has announced. UK haulage firms already have to pay to make journeys in other European Union countries, including France. Transport Minister Mike Penning said charging overseas companies would create a "fairer" situation."
- "London to introduce new Ulta Low Emission Discount for Congestion Charge scheme; countering dieselization". Green Car Congress. 24 April 2013. Retrieved 24 April 2013.
- "London tightens up congestion charge in attempt to drive out diesel". The Guardian. 24 April 2013. Retrieved 24 April 2013.
- Peter Samuel (2001-01-11). "Peak/Off-Peak Tolls:Whitman whittles down PANYNJ tolls". TOLLROADSnews. Retrieved 2009-03-10.
- Ronald Smothers (2001-03-27). "Grumbling, but Still Moving, Under New Rush-Hour Tolls". New York Times. Retrieved 2009-03-10.
- "New Toll Rates – Effective, 3 AM, March 2, 2008: Frequently Asked Questions (FAQS)". Port Authority of New York and New Jersey. Retrieved 2009-03-10.[dead link]
- (2010-03-30). "Congestion Pricing Dies in Albany". NY1. Retrieved 2010-12-12.
- Malia Wollan (2009-01-04). "San Francisco Studies Fees to Ease Traffic". The New York Times. Retrieved 2009-02-22.
- Rachel Gordon (2010-11-11). "S.F. may hit drivers with variety of tolls". San Francisco Chronicle. Retrieved 2010-12-05.
- Heather Ishimaru (2010-11-10). "SF considers downtown congestion pricing". ABC7 News San Francisco. Retrieved 2010-12-05.
- Michael Cabanatuan (2010-05-13). "Reminder: Bridge tolls go up July 1". The San Francisco Chronicle. Retrieved 2011-01-21.
- "Urban Partnerships". U.S. Department of Transportation. Archived from the original on June 28, 2008. Retrieved 2008-06-20.
- "San Francisco Urban Partnership Agreement". U.S. Department of Transportation. Retrieved 2008-06-20.
- "Seattle (Lake Washington) Urban Partnership Agreement". U.S. Department of Transportation. Retrieved 2008-06-20.[dead link]
- "Miami Urban Partnership Agreement". U.S. Department of Transportation. Archived from the original on May 3, 2008. Retrieved 2008-06-20.
- "Minneapolis Urban Partnership Agreement". U.S. Department of Transportation. Retrieved 2008-06-20.[dead link]
- Jennifer Lee (2008-04-29). "Chicago Gets New York's Congestion Money". The New York Times. Retrieved 2008-06-20.
- Small, Kenneth A.; José A. Gomez-Ibañez (1998). Road Pricing for Congestion Management: The Transition from Theory to Policy. The University of California Transportation Center, University of California at Berkeley. pp. 226–232.
- Andrew Downie (2008-04-21). "The World's Worst Traffic Jams". Time. Retrieved 2013-06-27.
- Marta Salomon, Iuri Dantas and Andréa Jubé Vianna (2012-01-09). "Lei federal autoriza criação de pedágio urbano por prefeituras" [Federal law authorizes the creation of congestion pricing by local governments]. O Estado de S. Paulo (in Portuguese). Retrieved 2013-06-26.
- Agência Estado (2012-01-04). "Dilma aprova lei que prevê pedágio urbano" [Dilma approves law that allows congestion pricing]. R7 Noticias (in Portuguese). Retrieved 2013-06-26.
- Presidência da República (2012-01-03). "Lei Nº 12.587, de 3 de Janeiro de 2012" [Law N. 12.587 of January 3rd, 2012] (in Portuguese). Presidência da República, Casa Civil. Retrieved 2013-06-26. See article 23.
- Roney Domingos (2012-04-25). "Projeto que cria pedágio urbano passa em comissão na Câmara de SP" [Bill to create congestion pricing passed in commission of the São Paulo city council]. O Globo (in Portuguese). Retrieved 2013-06-27.
- "Pedágio urbano de São Paulo pode custar até R$ 88 por mês" [São Paulo's congestion pricing could cost up to R$88 per month]. Terra (in Portuguese). 2012-04-26. Retrieved 2013-06-27.
- Claudia Jordão e Maria Paola de Salvo (2012-06-20). "Perdendo 30 bilhões de reais por ano por congestionamentos de trânsito, SP mira o exemplo do pedágio urbano de Londres" [Lossing 30 billion reais per year due to traffic congestion, São Paulo looks at the example of London congestion charges]. Veja São Paulo (in Portuguese). Retrieved 2013-06-27.
- Amanda Previdelli (2012-06-11). "Paulistano não quer pedágio urbano, segundo Datafolha" [São Paulo residents do not want congestion pricing according to Datafolha]. Exame (magazine) (in Portuguese). Retrieved 2013-06-27.
- "Pedágio urbano e incineração de lixo estão entre as propostas da SP 2040" [Congestion pricing and waste incineration are among the proposals of SP 2040]. Folha de S. Paulo (in Portuguese). 2012-11-13. Retrieved 2013-06-27.
- UK Commission on Integrated Transport. "Road Charging Scheme: South America – Chile, Santiago de Chile". Retrieved 2008-07-04.[dead link]
- Costanera Norte Freeway. "Costanera Norte Freeway" (in Spanish).
- "Costanera Norte Tarifas 2010" (in Spanish). Sociedad Concesionaria Costanera Norte. Retrieved 2010-02-27.[dead link] Three different tolls are charged based on pre-set average operating speeds: basic non-peak hour, basic rush hour, and fixed congestion toll.
- "Autopistas urbanas proponen subir tarifas y el MOP elabora plan para auditar alzas" (in Spanish). ODECU. 2009-07-15. Retrieved 2010-02-27.[dead link]
- Button, Kenneth J. (2010). Transport Economics 3rd Edition. Edward Elgar Publishing, Cheltenham, UK. ISBN 978-1-84064-191-2. (See Chapter 9: Optimizing Traffic Congestion)
- Santos, Georgina (editor) (2004). Road Pricing, Volume 9: Theory and Evidence (Research in Transportation Economics). JAI Press. ISBN 978-0762309689.
- Schade, Jens; Schlag, Bernhard (editors) (2003). Acceptability of Transport Pricing Strategies. Emerald Group Publishing, Bingley, West Yorkshire. ISBN 978-0080441993.
- Small, Kenneth A. (2008). "Urban Transportation". In David R. Henderson (ed.). Concise Encyclopedia of Economics (2nd ed.). Indianapolis: Library of Economics and Liberty. ISBN 978-0865976658. OCLC 237794267.
- Small, Kenneth A.; Verhoef, Erik T. (2007). The Economics of Urban Transportation. Routledge, New York. ISBN 978-0-415-28515-5. (See Chapter 4: Pricing)
- Smeed, R.J. (1964). Road pricing: the economic and technical possibilities. HMSO.
- Tsekeris, Theodore; Voß, Stefan (2009). "Design and evaluation of road pricing: State-of-the-art and methodological advances". Netnomics 10: 5–52. doi:10.1007/s11066-008-9024-z. http://dx.doi.org/10.1007/s11066-008-9024-z.
- Verhoef, Erik T.; Bliemer, Michiel; Steg, Linda; Van Wee, Bert (editors) (2008). Pricing in Road Transport: A Multi-Disciplinary Perspective. Edward Elgar Publishing, Cheltenham, UK. ISBN 978-1845428600.
- Walters, A. A. (1968). The Economics of Road User Charges. World Bank Staff Occasional Papers Number Five, Washington, D.C. ISBN 978-0-8018-0653-7.
- Combating Gridlock – Study of Deloitte Research on Congestion Charging
- Fuel for Thought – The what, why and how of motoring taxation Institute for Fiscal Studies (2012)
- National Alliance Against Tolls (Britain) Road pricing page
- Reducing Congestion and Funding Transportation Using Road Pricing in Europe and Singapore published by FHWA, AASHTO and the TRB
- Review of Road Pricing to Reduce Congestion, U.S. Government Accountability Office – 2012
- Road pricing case studies
- Transportation Research Board Committee on Road Pricing
- When the Road Price Is Right – Land Use, Tolls, and Congestion Pricing, Urban Land Institute, 2013, ISBN 978-0-87420-262-5
- TripSum @ Xeesa.com: Online Fuel/ ERP/ Taxi fare calculator to check and calculate Fuel cost, ERP(Toll pricing) and Taxi Fare needed for a motorist's driving or taxi trip in Singapore