RCW 46.61.655 states: No vehicle shall be driven or moved on any public highway unless such vehicle is so constructed or loaded as to prevent any of its load from dropping, sifting, leaking, or otherwise escaping therefrom, except that sand may be dropped for the purpose of securing traction. Any vehicle operating on a paved public highway with a load of dirt, sand, or gravel susceptible to being dropped, spilled, leaked, or otherwise escaping therefrom shall be covered so as to prevent spillage. Covering of such loads is not required if six inches of freeboard is maintained within the bed. Any vehicle with deposits of mud, rocks, or other debris on the vehicle's body, fenders, frame, undercarriage, wheels, or tires shall be cleaned of such material before the operation of the vehicle on a paved public highway.
Why is it that a similar law is enforced to the max in British Columbia (all dump trucks are covered) but our RCW 46.61.655 is very weakly enforced or not enforced at all in Washington State? I observe uncovered dump trucks in Whatcom County almost every time I make a trip.