Oliver 26 investigated the seasonal variations of skid resistance in Australia using the sideways force coefficient routine investigation machine SCRIM and found that pavement friction decreased with temperature according the following equation 26
SFCt/SFC25 =0.563+45.9(T+80) (R^2=0.83)
Where SFCt = side force coefficient of SCRIM at tire temperature T degree
SFC25 = side force coefficient of SCRIM at tire temperature 25 degree
Oliver 26 also studied the temperature effect on friction using a british pendutum tester A set of laboratory prepared surfaces covering a range of BPNs between 15 and 90 a range of surface textures between 0 and 1.5mm, were tested outdoors with temperatures ranging from 7 to 59 degree. A good correlation between the BPN and the pavement temperature was observed, as follows 26
BPNt/BPN20 = 1-0.00525*(T-20)