Odoliograph – Measurement of the skid resistance of road surfaces

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BRRC has an odoliograph for continuous measurements of skid resistance over the full length of a road section. This characteristic is important for the safety of road users. A tanker lorry is fitted with a fifth wheel carrying a specially designed smooth tyre with known characteristics. A water film is sprayed onto the road surface in front of the measuring wheel during travel. The measuring wheel is ballasted by a constant vertical force. It is yawed to an angle of 20° and consequently experiences a horizontal force (sideway force). The ratio between the two forces is expressed as a nominal value ranging between 0 and 1 (the sideway force coefficient, or SFC). The standard speed of the vehicle during a measurement is 50 km/h or 80 km/h.

 


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