The phrase vehicular cycling was coined by John Forester in the 1970s to characterize the style of cycling utilized in his native country, the United Kingdom, in contrast to the deferential-to-cars style of cycling and practices that he found to be typical in the United States. In his book Effective Cycling, Forester contends that "Cyclists fare best when they act and are treated as drivers of vehicles".
A vehicular cyclist is a cyclist who generally travels within the roadway in accordance with the basic vehicular rules of the road that are shared by all drivers and adhering to traffic controls.[a] Vehicular cyclists, Forester advises, should feel and act like vehicle drivers, albeit the drivers of narrow and relatively low-powered vehicles.[b]
- Ride on the road, with the direction of traffic.[d]
- Yield to crossing traffic at junctions with larger roads.
- Yield to traffic in any lane you are moving to, or when you are moving laterally on the road.
- Position yourself appropriately at junctions when turning — near the curb when turning off the road on the side you are travelling on, near the center line when turning across the other side of the road,[e] and in the center when continuing straight on.
- Ride in a part of the road appropriate to your speed; typically, faster traffic is near the center line.
Vehicular cycling theory specifies the position, motion and behavior of cyclists, and sets out several techniques for them to use.
Lane control is the practice of a cyclist controlling a lane (also known as "using the full lane", "taking control of the lane", "taking the lane" or "claiming the lane") when traveling near the center of a marked travel lane. Controlling the lane normally precludes passing within the same lane by drivers of motor vehicles, while being positioned near a lane edge usually encourages such passing—even when it is hazardous to cyclists.
Vehicular cyclists commonly control lanes under the following circumstances:
- when the lane is too narrow for cyclists to share the lane safely side-by-side with a motor vehicle
- when approaching a junction (because approaching or waiting traffic may turn or cross directly in front of the cyclist)[f]
- when there is more than one lane of traffic going in the cyclist's direction
- when the cyclist is traveling at the normal speed of traffic at that time and place
- when the cyclist is the only traffic moving in that direction at that time and place, regardless of the cyclist's speed
- when occupying a gap in traffic (to improve vantage and maneuvering space with respect to noticing and avoiding hazards up ahead, and to increase conspicuousness to traffic approaching from the rear as well as to traffic with potential crossing conflicts up ahead)
- when approaching a place where the lane narrows (such as a construction zone) so as not to be "squeezed out" when that happens
- when merging across a roadway in preparation for a turn across the opposing lanes
- when overtaking and passing another vehicle or bicycle
- when avoiding hazards
- when approaching an intersection or junction at which the cyclist plans to go straight
- when approaching or traveling in a roundabout or traffic circle
- when approaching a blind hill crest or blind curve, to discourage overtaking
Due to the relatively narrow nature of bicycles, road lanes are sometimes wide enough to allow them to safely share lanes side by side with motor vehicles. In lanes where this is possible, vehicular cycling suggests riding about 1 metre (3.3 ft) to the outside of overtaking traffic and about the same distance from roadside hazards such as the gutter seam. Cyclists can also filter forward past stopped motor traffic. Where they exist, wide outside lanes may also be shared in order to facilitate being overtaken by faster traffic.
When riding in a lane sharing position, vehicular cycling specifies that cyclists must yield to overtaking traffic using the other part of the lane, or obtain right-of-way to move over through negotiation before moving laterally into that space.
Speed and destination positioning
Vehicular cyclists use "speed positioning" between intersections. The basic principle is "slower traffic keeps to the outside; faster traffic to the inside". When lanes are marked, vehicular cyclists generally operate in the outermost travel lane. When lanes are not marked, vehicular cyclists generally operate as far to the outside of the traveled way as is reasonably efficient and safe.
As vehicular cyclists approach a junction of ways, the principle of "destination positioning" comes into play, and they should position themselves laterally according to their destination (left, straight or right):
- Where lanes are marked, vehicular cyclists approaching a junction should choose the outermost lane that serves their destination.
- When lanes are not marked, vehicular cyclists approaching a junction will travel along the inside of their side of the road if turning toward the inside, along the outer side if turning to the outside, and in between if going straight.
When choosing where to travel on the street, vehicular cyclists ignore designated bicycle lane stripes. This does not mean that they avoid riding in bicycle lanes, rather deciding whether to ride in the space demarcated as a bike lane just as one would if the stripe were not there. They are also advised to stay outside of the door zone; when passing motor vehicles that are parked parallel to the road, no closer than the largest estimated width of an open door, plus some margin for error.
The cycling skills manual Cyclecraft, the foundation of Bikeability, the UK's national standard for cycle training, defines the terms primary riding position, where the cyclist will be more visible and predictable to motor vehicle traffic, as being in the center of the traffic lane, and secondary riding position as being 1 metre (3.3 ft) to the side of moving traffic, but not closer than 0.5 metres (1.6 ft) from the edge of the road. It states that it is sensible to use the primary riding position as the normal position, only using the secondary riding position when it is safe, reasonable, and necessary to allow faster traffic to pass.
On multi-lane roadways, some vehicular cyclists ride on the inside of the outermost lane (on the side furthest from the road edge in the lane nearest the road edge), for enhanced visibility to motor vehicle traffic. This position may be indicated by road markings.[g]
Vehicular cycling advocates looking back over one's shoulder as a key skill, in order to
- check that moving laterally or turning will not intersect the path of someone who is overtaking
- broadcast the cyclist's desire (to move laterally or turn) to other road users so that they can better predict the cyclist's path
- see if someone who's overtaking is about to make a mistake and enter the cyclist's path
Particularly in slow traffic, a cyclist's look to the rear may serve as a signal, allowing the cyclist to keep both hands on the handlebar. However, a cyclist may also use a hand signal (arm extended to the side) to request that an overtaking driver make room. The cyclist then follows up with a second look to the rear to assure that the driver has made room.
Negotiation is a technique for cyclists to safely traverse one or more lanes by merging in with the flow of other traffic. The basic method is to negotiate for the use of the adjacent lane, move into that lane, and then repeat the process for any additional lanes. The cyclist moves only when there is a natural gap in motor traffic to move into, or after someone slows down explicitly to allow them to move over.
The steps of the process for each lane change are:
- Look back for traffic that may be overtaking in the target lane.
- Wait for a sufficient gap to change lanes. If necessary, use a hand signal to request an approaching driver in the target lane to yield right of way by slowing down and leaving unoccupied space in the lane in front of them.
- Move into the lane and control it.
Segregated cycling as an alternative
Segregated cycle facilities exist in some areas, allowing cycling without sharing roads with motorized traffic. Cities that provide such facilities report a high degree of usage and lower injury rates, such as in The Netherlands. A 2001 study in Edmonton, Canada concluded that cyclists found 1 minute of cycling in mixed traffic as onerous as 4.1 minutes on bike lanes or 2.8 minutes on bike paths. A study of cyclists in Washington D.C.found that cyclists were willing to spend on average 20.38 extra minutes per trip to travel on an off-street bicycle trail when the alternative was riding on a street with parked cars. Forester believes segregated cycle facilities to be more dangerous than on-road cycling and that, in the case of sidepaths, they can only be used safely by cycling "very slowly".
Forester's view has drawn criticism; urban planning professor John Pucher writes that "although Forester makes a number of theoretical arguments why bikeways are unsafe, his empirical test of the superiority of vehicular cycling is based on a sample of one—a single bike ride he took on a new bike path in Palo Alto, California." Forester objects to rejection of his test results as being non-scientific due to the test not having been repeated by anyone else.
Pucher's various transnational studies of bicycle transportation lead him to conclude that "the overwhelming evidence is that cycling is much safer and more popular precisely in those countries where bikeways, bike lanes, special intersection modifications, and priority traffic signals are the key to their bicycling policies." The authors of a 2009 meta-study on cycle infrastructure safety research at the University of British Columbia similarly conclude that "in comparison to cycling on bicycle-specific infrastructure (paths, lanes, routes), on-road cycling appears to be less safe."
Forester objects to Pucher's conclusions, primarily on the grounds that Pucher ascribes the increase in use of bikes and bike safety observed to the bikeways without showing that the bikeways are the actual cause of the increased use or safety.
Jennifer Dill and Theresa Carr's research on bicycle transportation in 35 U.S. cities also suggests that "higher levels of bicycle infrastructure are positively and significantly correlated with higher rates of bicycle commuting"; and a 2010 study comparing streets in Copenhagen that had had cycle tracks and bicycle lanes added to them found that cycling volume increased 20%. However, on the cycle track streets bicycle accidents increased 10% more than would be expected from the changed bicycle and automobile traffic volumes, making the cycle tracks less safe for cyclists than the unmodified roads. Streets with bicycle lanes added saw a 5% increase in bicycle traffic but a 49% increase in bicycle accidents. Despite this, the study notes that "the gains in health from increased physical activity [from increased numbers cycling are] much, much greater than the losses in health resulting from a slight decline in road safety." Although prior studies did not differentiate between new bike riders and those that had changed routes due to the new facility, recent research has shown that the greater level of protection, the greater number of new bike riders (as opposed to riders who used the route prior to construction or shifted routes). 
Forester's system of cycling has drawn criticism as being unsuitable for anyone but skilled, strong riders, with his assessment of skill being based upon speed. Bruce Epperson claimed that, in a 1978 article, Forester required cyclists to sustain a speed of 18 miles per hour (29 km/h), a feat achievable by only 3% of Americans. The claim was subsequently refuted by Forester.
The movement surrounding vehicular cycling has also been criticized for its effect on bicycle advocacy in general. In Pedaling Revolution, Jeff Mapes states that Forester "fought bike lanes, European-style cycletracks, and just about any form of traffic calming", and "saw nothing wrong with sprawl and an auto-dependent lifestyle." Zack Furness is highly critical of vehicular cyclists in One Less Car: Bicycling and the Politics of Automobility, arguing that their criticism of 'political' cyclists "totally ignores all the relevant socioeconomic, physical, material, and cultural factors that influence—and in most cases dictate—everyday transportation choices." Critical Mass co-founder Chris Carlsson describes vehicular cycling as a naive, polarizing "ideology" that "essentially advocates bicyclists should strive to behave like cars on the streets of America."
- List of cycling topics
- Smart Cycling, the League of American Bicyclists' vehicular cycling course
- CAN-BIKE, the Canadian vehicular cycling course
- Utility cycling
- Such as yield (give way) signs, stop signs and traffic lights.
- In Bicycle Transportation, Forester writes that "there is much more to the vehicular-cycling principle than only obeying the traffic laws for drivers. The vehicular-style cyclist not only acts outwardly like a driver, he knows inwardly that he is one. Instead of feeling like a trespasser on roads owned by cars he feels like just another driver with a slightly different vehicle, one who is participating and cooperation in the organized mutual effort to get to desired destinations with the least trouble."
- Forester asserts that "If you obey these five principles, you can cycle in many places you want to go with a low probability of creating traffic conflicts. You won't do everything in the best possible way, and you won't yet know how to get yourself out of troubles that other drivers may cause, but you will still do much better than the average American bicyclist."
- For cycling in particular, collisions at intersections (defined broadly as "not only the junction of two roadways, but also points where driveways, sidewalks, or paths meet a roadway, or where sidewalks or paths meet a driveway") while traveling in the wrong direction against traffic has been determined to be over three times more likely for wrong-way cyclists. Wrong-way cycling increases closing speeds and wrong-way cyclists are easily overlooked by motorists at intersections. Wrong-way cycling also makes bike-bike collisions more likely. 
- Depending which side of the road traffic moves on, this may be turning left or right. Forester's book, being written in the United States, assumes traffic driving on the right.
- Quoted in the San Francisco Chronicle, bicycle skills instructor Bert Hill states that "when approaching an intersection where a dashed dividing line appears, riders should move to the left so that motorists can move in behind and make right turns unobstructed."
- In Salt Lake City, this left-of-center position is painted by the City in green along with shared lane markings on several downtown roadways.
- Forester (1993).
- Forester (1993), p. 285.
- Forester (1994), p. 3.
- Forester (1993), p. 246.
- Wachtel & Lewiston (1994), pp. 30-35.
- IPMBA (2008), p. 77.
- Forester (1993), p. 272.
- Tanner (2009).
- Forester (1993), p. 284.
- Forester (1993), p. 297.
- Franklin (1997), pp. 58-59.
- Page (2008).
- Hunt & Abraham (2007), pp. 453-470.
- TRBNA (2006), p. 38.
- Forester (2001).
- Forester (2010).
- Pucher (2001).
- Reynolds (2009), p. 47.
- Dill & Carr (2003), pp. 116-123.
- Jensen, Rosenkilde and Jensen (2007).
- Jensen (2007).
- Monsere (2014).
- Epperson (1994), p. 12-13.
- Forester (2006).
- Mapes (2009).
- Furness (2010), pp. 72-73.
- Carlsson (2007), p. 87.
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- Forester, John (1996). "Listening to Bike Lanes: Moving Beyond the Feud: by Jeffrey A. Hiles, 1996: Review by John Forester". Retrieved 13 June 2013.
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- Franklin, John (1997). Cyclecraft. The Stationery Office. ISBN 0-11-702051-6.
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- Mapes, Jeff (2009). Pedaling Revolution: How Cyclists are Changing American Cities. Oregon State University. ISBN 978-0-87071-419-1. Retrieved 2012-08-07.
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- Page, Jared (2008-09-18). "S.L. cyclists get share of lane on 200 South". Deseret News. Retrieved 2012-08-09.
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- Reynolds, Conor CO; Harris, M Anne; Teschke, Kay; Cripton, Peter A; Winters, Meghan (October 2009). "The Impact of Transportation Infrastructure on Bicycling Injuries and Crashes: A Review of the Literature". Environmental Health 8 (47): 47. doi:10.1186/1476-069X-8-47. PMC 2776010. PMID 19845962. Retrieved 2010-07-02.
- Tanner, Michael (June 4, 2009). "Safe streets: Workshops help cyclists trim risk". San Francisco Chronicle. pp. F–32. Retrieved June 9, 2009.
- Wachtel, Alan; Lewiston, Diana (September 1994). "Risk Factors for Bicycle-Motor Vehicle Collisions at Intersections" (PDF). ITE Journal (Institute of Transportation Engineers).
- Monsere, Christopher; Dill, Jennifer (June 2014). "Lessons from the Green Lanes: Evaluating Protected Bike Lanes in the U.S.". Transportation Research Board.