Skid Resistance


Skid Resistance of road surfaces can be measured in multiple ways. In the UK three principles are used for traffic speed assessments of skid resistance, sideways force measurement (e.g. SCRIM), fixed slip (e.g. GripTester) and locked wheel (e.g. Pavement Friction Tester).

Sideways force skid resistance Survey devices

The skid resistance standard, CS 228 (part of the Design Manual for Roads and Bridges or DMRB) specifies that routine surveys of the trunk road network will be undertaken with an accredited sideways force skid resistance survey device. These surveys are conducted at either 50km/h or 80km/h target speeds (depending on the road). The data is then speed corrected to 50km/h before analysis.

These devices employ a test wheel angled to the direction of travel and are described in BS7941-1. The angle of the test tyre forces it to slip against the road surface, allowing the skid resistance of the surface to be assessed through the measurement of forces on the tyre. The Accreditation and QA requirements for these devices are given in the Accreditation and QA specification.

Accreditation_and_QA_of_Sideway-force_Skid_resistance_devices Issue 4.1 Jun 2020

If you are looking for a contractor to carry out skid resistance surveys compliant with CS 228 on your behalf, you may wish to check the list of Sideways force skid resistance Survey devices where you can also find the latest accreditation certificates.