Well yes but if people are working more hours than they really should be then it simply suggests that there is a need for more truckers. I don't think it would be physically healthy for someone to constantly keep on doin' 15 hours a day, without proper stops.
Also I'm kinda of confused about the truck speed limits. Everyone keeps on talkin about doing 70-80 mph, but ain't that only for passenger cars? Wiki seems to think that trucks have speed limit of 55mph as far as I can understand.
Uh little fact, (remember someone discussing about how many accidents are cause by retarded drivers.) "Two thirds (67%) of truck/passenger car crashes are the fault of the passenger vehicle."