Highway department experts in the mid-1920s were aware that traffic volume and speed were primarily causes of corrugations on gravel roads and cited the role of drive wheels tossing material as a factor.
Traffic volume and speed were primarily causes of corrugations on gravel roads. Highway department experts in the mid-1920s were aware this. Highway department experts in the mid-1920s cited the role of drive wheels. These drive wheels were tossing material as a factor.