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, fixed slip and locked wheel.
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.
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 below. On this page you can also find the latest accreditation certificates. In this table machines are referred to as having met criteria if they have met the mandatory criteria as defined in the Accreditation and QA specification for these devices. Some Network Authorities may also require a specific level of performance in some or all of the additional tests. Please see the certificates for more detail on the performance of these devices in these additional tests.
|ID||Reg plate||Operating Company||Met criteria||Certificate|
|03||IKZ 2203||DfI Roads||Yes|
|13||S7 WDM||WDM Ltd||Yes|
|17||S800 WDM||WDM Ltd||Yes|
|19||S900 WDM||WDM Ltd||Yes|
|21||KX07 YXH||Surrey County Council||Yes|
|23||S111 WDM||WDM Ltd||Yes|
|24||S12 WDM||WDM Ltd||Yes|
|25||S13 WDM||WDM Ltd||Yes|
|26||S14 WDM||WDM Ltd||No||Unassessed|
|28||WX60 AXN||TRL (on behalf of National Highways)||Yes|
|31||S16 WDM||WDM Ltd||Yes|
|33||17 2G 1777||PMS Eire||Yes|
|35||22 1G 1770||PMS Eire||Yes|
|37||S18 WDM||WDM Ltd||Yes|
* This device did not meet the automatic markers criteria for distance (a requirement for systems providing OSGR data) however it did meet the manual markers criteria.
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