FACTORS AFFECTING RESUSPENSION BY ROAD TRAFFIC

Fluorescent particles have been used to determine the effects of vehicle activity on resuspension rates. The dependences of resuspension on particle size and vehicle speed have been determined for a dry road. The experiments have included an examination of the change in surface concentration of particulate species, when a vehicle is driven directly over an area of deposited particles and when a tyre is allowed to pass through such an area. Atmospheric levels of trace species (Na+ and Cl-) have been used to make a separate assessment of resuspension by tyre spray from a wet road. © 1990.