Effect of road roughness on vehicle braking. Paper presented at the 52nd Annual Meeting of the Highway Research Board HRB, Washington, D.C., January 1973.

The loss of tyre braking friction due to road roughness was simulated and measured experimentally in a test machine designed to produce simultaneous wheel slip and vertical vibration of the contact surface. The most important conclusion reached is that friction predictions without road profile consideration can result in gross errors and may be one of the causes of lack of correlation of friction data.