--- title: What is road friction? description: Read the following blog post to learn more about friction between your vehicle and the road. image: https://intblog.onspot.com/hs-fs/hubfs/North_America/truck-snow-tires-281449-edited.jpg --- [![](https://www.onspot.com/imagevault/publishedmedia/ewjmu1x672ip2pj4oovu/Onspot_Logo.png)](https://www.onspot.com/en-US/) - [Why Onspot](https://www.onspot.com/en-US/why-onspot/) - Knowledge - [Overview](https://www.onspot.com/en-US/knowledge/overview/) - [Ways to increase traction](https://www.onspot.com/en-US/knowledge/ways-to-increase-traction/) - [For fleet managers](https://www.onspot.com/en-US/knowledge/for-fleet-managers/) - [For drivers](https://www.onspot.com/en-US/knowledge/for-drivers/) - [For mechanics](https://www.onspot.com/en-US/knowledge/for-mechanics/) - [Rules & regulations](https://www.onspot.com/en-US/knowledge/rules--regulations/) - [Knowledge Center](https://knowledge.onspot.com/en-us/knowledge-center-for-winter-driving-and-traction) - The product - [Overview](https://www.onspot.com/en-US/the-product/overview/) - [Testimonials](https://www.onspot.com/en-US/the-product/testimonials/) - [FAQ](https://www.onspot.com/en-US/the-product/faq/) - [Documents, manuals and brochures](https://www.onspot.com/en-US/the-product/documents-manuals-and-brochures/) - [How it works-videos](https://www.onspot.com/en-US/the-product/how-it-works/) - [Measuring forms](https://www.onspot.com/en-US/the-product/documents-manuals-and-brochures/sales-brochures2/) - About - [Overview](https://www.onspot.com/en-US/about-onspot---about-us/overview/) - [History](https://www.onspot.com/en-US/about-onspot---about-us/history/) - [News & Press releases](https://blog.onspot.com/news-press-releases) - [Regional Manager Contact](https://www.onspot.com/en-US/about-onspot---about-us/regional-manager-contact/) - Blog - [Blog articles](https://intblog.onspot.com/en-us) - [All about automatic tire chains](https://knowledge.onspot.com/en-us/all-about-automatic-tire-chains) - [Traction aids for heavy vehicles](https://knowledge.onspot.com/en-us/traction-aids-for-heavy-vehicles) - [Support](http://support.onspot.com/en-US/) - [E-Training](https://www.onspot.com/en-US/e-training/) - [North America](https://onspot.com/?s=false) - [Contact us](https://www.onspot.com/en-US/contact-us/) # What is road friction? Written by [Maritza Hernandez](https://intblog.onspot.com/en-us/author/maritza-hernandez), September 17, 2018 **Friction and traction are key to avoid sliding vehicles and spinning wheels.** Friction is defined as the rubbing of one object or surface against another. The friction between your vehicles’ tires and the road will determine maximum acceleration and minimum stopping distance. The force of friction depends on the force pushing the objects or surfaces together and the coefficient of friction. The coefficient of friction is the relationship between the force required to move the surfaces against each other and the pressure to stay in contact while in motion. To learn more, read the blog post [What is traction, friction and road grip?](https://blog.onspot.com/blog/what-is-traction-friction-and-road-grip) **The Coefficient of Friction (COF)** The coefficient of friction defines the slipperiness of a road surface. The lower the COF value, the more slippery the material. So, for example, two ice cubes pressed together will slide easily, two pieces of rubber will not, due to the gripping contact area increasing and consequently the friction. ![Road Friction Table](https://intblog.onspot.com/hubfs/North_America/Road%20Friction%20Table.jpg) However, COF is an empirical measure, i.e. it is a result of practical experiments and comparisons rather than theoretical calculations. Thus, the COF value is an approximation because of the many calculation variables. Yet, it is a practical measure since the value gives us an idea of slipperiness.  **Is there a specific COF value for roads?** COF values for different specific road pavement would come in handy. Why aren’t there such? Although the materials used are similar, the dominant variable will be the texture or roughness of the pavement. So, how is this measurement accomplished when the surfaces are so different? Using laser technology, it is possible to measure the macro-texture and get an idea of the ruggedness and frictional features of road pavement. Also, testing can be done with a surface friction tester that measures the resistance experienced by the wheel and stopping distance. **Is there a scale for road friction?** Currently, there is no standardized scale for road friction. The measurement of road friction involves considering the cumulative effects of snow, ice, loose materials like sand and the [texture of pavement](https://blog.onspot.com/blog/why-do-bridges-become-icy-before-roads)on wheel traction. Many devices and methods have been developed around the world to measure the friction and texture of road surfaces. Adequate comparisons and harmonization of different research and test results will improve road safety development over time. Ideally, there should be an international common definition and scale for road friction. However, different initiatives are driving development such as NASA, FAA, and Transport Canada's 5-year joint research effort to focus on proving technology concepts for a better understanding of runway friction, Virginia Tech’s research effort to compare and harmonize texture and skid resistance measurements plus there are numerous research efforts by different countries and agencies to better understand the behavior of different friction testing devices and the influence of texture, speed, and other external conditions on their measurements. **What do we do now?** Ultimately, safety is all about how we drive. Regardless of engineering methods, scales and values, slowing down and being attentive is the best way to keep traction and improve safety when roads are icy and slippery. However, losing traction may still occur so drivers should err on the side of caution and leave sufficient distance for reaction time and less than perfect road conditions. In addition to cautious driving, installing [traction devices](https://blog.onspot.com/blog/traction-devices-explained-onspot-vs.-alternatives) such as automatic tire chains can keep you on the road and to your destination safely.   [Truck driver safety](https://intblog.onspot.com/en-us/topic/truck-driver-safety) [automatic tire chains](https://intblog.onspot.com/en-us/topic/automatic-tire-chains) [icy conditions](https://intblog.onspot.com/en-us/topic/icy-conditions) [improve performance on slippery roads](https://intblog.onspot.com/en-us/topic/improve-performance-on-slippery-roads) [School Bus Safety](https://intblog.onspot.com/en-us/topic/school-bus-safety) ![Maritza Hernandez](https://intblog.onspot.com/hubfs/Blog_images/Persons/Maritza.jpg) #### About [Maritza Hernandez](https://intblog.onspot.com/en-us/author/maritza-hernandez) Maritza was the Marketing Coordinator at Onspot of North America. She was with Onspot for many years and holds a Bachelor of Science in Criminal Justice - Investigative Services. She moved from Connecticut to Indiana in 2016. When she is not working, she can be found reading, walking her dog Petey or discovering the sights and sounds of Indiana. ## Comments ### Subscribe to blog updates ### Recent Posts ### Posts by Topic - [automatic tire chains (66)](https://intblog.onspot.com/en-us/tag/automatic-tire-chains) - [Commercial Driver (43)](https://intblog.onspot.com/en-us/tag/commercial-driver) - [Fleet Managers (38)](https://intblog.onspot.com/en-us/tag/fleet-managers) - [onspot (37)](https://intblog.onspot.com/en-us/tag/onspot) - [driver safety (29)](https://intblog.onspot.com/en-us/tag/driver-safety) - [Rescue Driving (28)](https://intblog.onspot.com/en-us/tag/rescue-driving) - [Rescue Vehicles (25)](https://intblog.onspot.com/en-us/tag/rescue-vehicles) - [Slippery Roads (24)](https://intblog.onspot.com/en-us/tag/slippery-roads) - [traction (24)](https://intblog.onspot.com/en-us/tag/traction) - [icy conditions (22)](https://intblog.onspot.com/en-us/tag/icy-conditions) - [School Bus Safety (21)](https://intblog.onspot.com/en-us/tag/school-bus-safety) - [Fleet Maintenance (20)](https://intblog.onspot.com/en-us/tag/fleet-maintenance) - [Fleet Productivity (20)](https://intblog.onspot.com/en-us/tag/fleet-productivity) - [Improving Fleet Productivity (20)](https://intblog.onspot.com/en-us/tag/improving-fleet-productivity) - [Improving performance on icy roads (20)](https://intblog.onspot.com/en-us/tag/improving-performance-on-icy-roads) - [Maintenance (20)](https://intblog.onspot.com/en-us/tag/maintenance) - [Automatic Snow Chains (18)](https://intblog.onspot.com/en-us/tag/automatic-snow-chains) - [For Mechanics (18)](https://intblog.onspot.com/en-us/tag/for-mechanics) - [Response Time (17)](https://intblog.onspot.com/en-us/tag/response-time) - [tire chains (17)](https://intblog.onspot.com/en-us/tag/tire-chains) - [Automatic Tire Chains and Alternatives (14)](https://intblog.onspot.com/en-us/tag/automatic-tire-chains-and-alternatives) - [Engineering (14)](https://intblog.onspot.com/en-us/tag/engineering) - [school bus driver (14)](https://intblog.onspot.com/en-us/tag/school-bus-driver) - [All about automatic tire chains (13)](https://intblog.onspot.com/en-us/tag/all-about-automatic-tire-chains) - [Application (13)](https://intblog.onspot.com/en-us/tag/application) - [Fire Truck (13)](https://intblog.onspot.com/en-us/tag/fire-truck) - [School bus driving (13)](https://intblog.onspot.com/en-us/tag/school-bus-driving) - [Traction aids for heavy vehicles (13)](https://intblog.onspot.com/en-us/tag/traction-aids-for-heavy-vehicles) - [Truck driver safety (13)](https://intblog.onspot.com/en-us/tag/truck-driver-safety) - [e-training (13)](https://intblog.onspot.com/en-us/tag/e-training) - [Commercial Drivers (12)](https://intblog.onspot.com/en-us/tag/commercial-drivers) - [Winter driving tips (12)](https://intblog.onspot.com/en-us/tag/winter-driving-tips) - [improve performance on slippery roads (12)](https://intblog.onspot.com/en-us/tag/improve-performance-on-slippery-roads) - [snow chains (12)](https://intblog.onspot.com/en-us/tag/snow-chains) - [Innovation (10)](https://intblog.onspot.com/en-us/tag/innovation) - [Snow chain (10)](https://intblog.onspot.com/en-us/tag/snow-chain) - [Delivery (9)](https://intblog.onspot.com/en-us/tag/delivery) - [Traction aid for heavy vehicles (9)](https://intblog.onspot.com/en-us/tag/traction-aid-for-heavy-vehicles) - [improving uptime (9)](https://intblog.onspot.com/en-us/tag/improving-uptime) - [Ambulance (8)](https://intblog.onspot.com/en-us/tag/ambulance) - [Automatic Tire Chains Explained (8)](https://intblog.onspot.com/en-us/tag/automatic-tire-chains-explained) - [Onspot service (7)](https://intblog.onspot.com/en-us/tag/onspot-service) - [Winter equipment (7)](https://intblog.onspot.com/en-us/tag/winter-equipment) - [Schedule (6)](https://intblog.onspot.com/en-us/tag/schedule) - [Response time – a challenge for the rescue driver (5)](https://intblog.onspot.com/en-us/tag/response-time-a-challenge-for-the-rescue-driver) - [modern technology (5)](https://intblog.onspot.com/en-us/tag/modern-technology) - [Black ice (4)](https://intblog.onspot.com/en-us/tag/black-ice) - [Content for commercial drivers (4)](https://intblog.onspot.com/en-us/tag/content-for-commercial-drivers) - [Driver Recruitment and Rentention (4)](https://intblog.onspot.com/en-us/tag/driver-recruitment-and-rentention) - [Expediter (4)](https://intblog.onspot.com/en-us/tag/expediter) - [fleet efficiency (4)](https://intblog.onspot.com/en-us/tag/fleet-efficiency) - [4x4 (3)](https://intblog.onspot.com/en-us/tag/4x4) - [5 ways to improve uptime of your fleets! 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