Division 2.2.2 Reference conditions

The source equations and coefficients are valid for the following reference conditions:

• a constant vehicle speed

• a flat road

• an air temperature τ_ref = 20 °C

• a virtual reference road surface, consisting of an average of dense asphalt concrete 0/11 and stone mastic asphalt 0/11, between 2 and 7 years old and in a representative maintenance condition

• a dry road surface

• no studded tyres.