I searched but could not retrieve a satisfactory answer. It seems matter-of-fact that all sorts of work equipment, namely backhoes, loaders and other similar mororized vehicles without licence plates, sometimes equipped with a slow moving vehicle sign, often not, some with an amber beacon, some without, are encountered on a highway, travelling under their own power, sometimes on multi-lane roads and often for considerable distances. I was under the impression that these vehicles are not licenced to be on a highway and have to be trailered between work sites. Am I wrong?? I see many close calls with these slow moving, mobile traffic jams and wonder why this seems to be acceptable, yet an ATV or similar vehicle generally has to stay off the highway. Insights?