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HIGH FRICTION ROADS
HIGH FRICTION:
In 1995, the Highways Agency, County Surveyors’ Society, and the British Board of Agrément organized the Highways Authorities Product Approval Scheme, known as HAPAS, to develop national approval arrangements for innovative products, materials and systems for use in highways and related areas.
HAPAS was formed to ensure consistency and high quality products used in the UK. In order for an innovative product to be used in the UK, it must pass a series of laboratory and field tests, site inspections, and evaluation of the source production. Any manufacturer or vendor must adhere to HAPAS approval processes, and if successful, will obtain a Certificate.
Certification process for HFS manufacturers: In order for an HFS system to be certified under HAPAS, it must follow the Guidelines Document for the Assessment and Certification of High-Friction Surfacing for Highways.
Certification process for HFS installers: Installers of any HFS systems in the UK must be certified, and must follow the Assessment and Surveillance Scheme for Installers of High-Friction Surfacing for Highways.
Certified vendors and installers can also be found on the HAPAS website, along with a copy of their certificate.
All information on these websites is free: HAPAS website and BBA website.
Do you have any publicly available reports or publications that we can post? Contact us here.
Pavement Microtexture – deviations of a pavement surface from true planar surface with wavelength characteristics less than 0.5 mm.
Pavement Surface Characteristic – a physical feature or property of a pavement surface (i.e. skid resistance, roughness, texture, type)
Portable Skid Resistance Tester – also known as the “Pendulum Tester”, measures the PSV and SRV of a surface.
Polished Stone Value (PSV) – value that gives a measure of the resistance to the polishing action of vehicle tires. The higher the PSV value, the more resistant the aggregate is to polishing.
Sideways Force Coefficient (SFC) – value of the skidding resistance obtained when using the SCRIM®. SRV and SFC are not interchangeable.
Sideways Force Coefficient Routine Investigation Machine (SCRIM®) – equipment used to determine the skidding resistance of a road surface, resulting in a SFC value.
Skid Number (SN) – value representing the skid of a surface obtained from using the locked-wheel trailer.
Skid Resistance – the ability of the traveled surface to prevent the loss of tire traction.
Skid Resistance Value (SRV) – a measure of skid from the actual road surface, usually determined by using the Portable Skid Resistance Tester. This value is dependent on the PSV of the aggregate and the macrotexture of the surface.
Wheel Path – the parts of the pavement surface where the majority of vehicle wheel passages are concentrated.
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