Snow tire

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This article is about Snow tires. For winter tires, see Winter tire.
Studded snow tire

Snow tires are tires designed for use in colder weather, snow and ice. Snow chains can be a slower-speed, temporary alternative in snowy conditions. Studded tires can greatly reduce skidding and accidents on snow or ice covered roads.[1]

Snow tires have more sipes than summer tires, increasing traction on snow and ice, but reducing grip on dry and wet roads.[2] Tires designed for winter conditions are optimized to drive at temperatures below 7 °C (45 °F).

In much of Scandinavia, Canada, and the US, snow tires may have metal studs to improve grip on packed snow or ice, but such tires are prohibited in certain other jurisdictions because of the damage they cause to the road surface.[3] The metal studs are fabricated by encapsulating a hard pin in a softer material. The pin is often made of tungsten carbide, a very hard high performance ceramic. The softer base is the part that anchors the stud in the rubber of the tire. As the tire wears with use, the softer base wears so that its surface is at about the same level as the rubber, whereas the hard pin wears so that it continues to stick out of the tire. The pin should stick out at least 1 mm for the tire to function properly.[4] Snow tires do not eliminate skidding on ice and snow, but they greatly reduce risks.[5]

Regional symbols and rules[edit]

North America[edit]

Alpine Symbol, as required by the U.S. National Highway Traffic Safety Administration (NHTSA) for snow tires.
North American symbols for snow tire and winter tire ratings

In the United States and Canada, a "3PMSF ("Three Peak Mountain Snow Flake")" symbol means that the tire has exceeded the industry requirement from a reference (non-snow) tire.[citation needed]

In the province of Quebec, Canada, winter tires are mandatory on all vehicles from Dec 15 to March 15.[6]

Canadian requirements by province or territory[edit]

[7]

British Columbia

Snow tires are only required by law in certain mountainous regions. In these areas, motorists must use Winter tires or carry tire chains. Studded snow tires with studs up to 3.5 mm in length are permitted between October 1 and April 30. Regulations limit the number of studs to fewer than 130 per tire on vehicles weighing less than 4,600 kg.

Alberta

There are no requirements for snow tires. Studded tires and chains are allowed.

Saskatchewan

There are no requirements for snow tires. Studded tires and chains are allowed.

Manitoba

There are no requirements for snow tires. Studded tires may be used from October 1 to April 30.

Ontario

There are no requirements for snow tires. Studded tires may only be used North of Parry Sound and Nipissing districts and only from October 1 to April 30. Northern Ontario residents may use studded tires anywhere in the province during this time. Southern Ontario residents may only use studded tires in Northern Ontario. They could face a $1,000 fine if caught using them in Southern Ontario.

Québec

Winter tires or studded tires must be used from December 15 to March 15. LT & AT tires on light trucks and SUV's are acceptable until 2014.

New Brunswick

There are no requirements for snow tires. Studded tires may be used from October 15 to May 1. School buses must use snow tires.

Nova Scotia

There are no requirements for snow tires. Studded tires may be used from October 15 to April 30.

Prince Edward Island

There are no requirements for snow tires. Studded tires may be used from October 1 to May 31.

Newfoundland

There are no requirements for snow tires. Studded tires may be used from November 1 to May 31.

Northwest Territories

There are no requirements for snow tires. There are no restrictions on studded tires.

Yukon

There are no requirements for snow tires. There are no restrictions on studded tires.

Nunavut

There are no requirements for snow tires. There are no restrictions on studded tires.


Europe[edit]

The Czech road sign Winter equipment, which mandates the use of snow tires in the winter

In Europe, requirements for snow tires vary by country: in Andorra, Austria,[8] Czech Republic, Estonia, Finland, Germany, Latvia, Lithuania, Luxembourg,[9] Romania, Serbia, Slovenia and Sweden, the use of snow tires is a legal requirement during winter months (usually November to mid-April) or if snow or slush is present on road surfaces; failure to comply can result in on-the-spot fines from the police. In Norway, drivers of light vehicles (less than 3,500 kg) are required to use winter tires according to conditions, studded tires are not allowed before November 1 unless required by road conditions.[10] Andorra, Italy and Switzerland all recommend snow tires but they are not a requirement.

In Germany tires with a Mud and Snow (M+S) marking must be used during winter conditions.[11] [12] M+S tires can be snow tires but all-season tires may also qualify.

Snow chains fitted to tires are required in Andorra, Austria, France, Germany, Italy, Spain and Switzerland in certain winter conditions.[13] In Norway, heavy vehicles (3,500 kg or more) are required to bring chains in winter conditions and to use winter tires November 15 to March 31.[14]

Since July 2008, the Czech Republic uses the Europe-wide road sign requiring the use of snow tires in marked mountainous areas during winter. The duration of obligatory snow tire use was originally November – April (Ordinance 208/2008 Sb.). This was later changed to November – March (Ord. 91/2009 Sb.).[citation needed]

Winter/Snow tyre requirements vary significantly across Europe, with different countries having different statutory requirements[15]

Economic and environmental impact[edit]

The studs in the snow tires come into the contact with the road surface and they eventually wear off the roads and cut ruts in the roads. Use of snow tires can be very costly because of abrasion of road surfaces due to studs in snow tires. In wet weather this can further cause problems when the ruts are filled with water and cause hydroplaning hazard.Furthermore it can result in creating polluting dust.[16]

References[edit]

  1. ^ "Prall Tester - Studded Tyre Wear Test". www.cooper.co.uk. Cooper Research Technology Ltd. Retrieved 1 September 2014. 
  2. ^ "Winter tyre basics". Tyremen UK. Retrieved 2012-10-24. 
  3. ^ ScienceDaily (6 January 2011). "How Studded Winter Tires May Damage Public Health, as Well as Pavement". Retrieved 26 January 2011. 
  4. ^ Nordström, Olle (2004). VTI Meddelande 965 - 2004 (Report).
  5. ^ Gustafsson, M., et al. (2006). VTI rapport 543 - Effekter av vinterdäck - en kunskapsöversikt (Report).
  6. ^ http://www.mtq.gouv.qc.ca/portal/page/portal/grand_public_en/vehicules_promenade/securite_routiere/securite_conditions_hivernales/reglement_utilisation_pneus_hiver/
  7. ^ http://ca.autoblog.com/2011/11/30/getting-to-know-snow-tire-laws-in-your-province/
  8. ^ "Winterausrüstungspflicht - was gilt?". ÖAMTC. Retrieved 22 January 2013. 
  9. ^ "Winter tyres mandatory in Luxembourg" Rezulteo tyres, Retrieved 6 February 2013
  10. ^ http://www.vegvesen.no/Kjoretoy/Sesongbehov/Dekk+og+kjettinger
  11. ^ "Driving to Europe in winter". The Automobile Association. Retrieved 16 January 2013. 
  12. ^ "Winterreifenpflicht bei Glatteis, Schneeglätte, Schneematsch, Eis- oder Reifglätte". Bayerische Polizei. Retrieved 16 January 2013. 
  13. ^ "Winter tyre and snow chain requirements". UK: The Automobile Association. Retrieved 11 December 2010. 
  14. ^ Norwegian Public Roads Administration (Statens vegvesen) chain rules published december 2011, accessed September 4, 2013.
  15. ^ "European winter tyre laws". Tyremen UK. 
  16. ^ "Studded Tyre Wear Test". www.cooper.co.uk. Cooper Research Technology Limited. Retrieved 3 September 2014.