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Rolling Resistance of Tyres on Different Carriageways

The rolling resistance of a vehicle's tyres influences its fuel consumption, and consequently, its CO2 emissions.

As part of a research program initiated by the Netherlands, two research institutes conducted comparative measurements of the rolling resistance of tyres on different carriageways using a number of measuring techniques. The Federal Highway Research Institute participated in this experimental program with its rolling resistance measurement trailer. The aim was to classify carriageways of various textures in terms of rolling resistance and establish differences between the measuring techniques.

It turns out that the rolling resistance coefficient (ratio between rolling resistance and wheel load) on the carriageways varies between 0.9 and 1.2 depending on the employed measuring technique. Routes comprising 0/8 mastic chippings and concrete exhibit the lowest rolling resistance coefficient, 0/11 poured asphalt the highest. Porous wearing courses exhibit medium values. The tests have a measuring accuracy of 2% to 4%, indicating a high degree of reproducibility.