This issue contains 13 papers concerned with the safety of trucks, buses and motorcycles. Specific topics discussed include the following: hours of service and truck crash risk; freeway truck lane restriction and differential speed limits; the condition of trucks and their crash involvement; noise level, whole-body vibration, and air quality inside cabs of heavy-duty diesel trucks; type of motor carrier and driver history in fatal bus crashes; the safety benefits from a heavy-vehicle forward collision warning system; a rearview video system as a countermeasure for truck backing crashes; rating roads for motorcyclist safety; novice motorcycle riders; right-angle crash vulnerability of motorcycles at signalized intersections; effects of horizontal curvature on single-vehicle motorcycle crashes; parking design for motorcycles; and riding behavior of heterogeneous young motorcyclists.