Robot semi trucks are a likely scenario they can go 24 hours without sleep, pay or benefits. You apparenetly are assuming that the robot semis will carry at least twice+(?) the fuel (an additional hazard) of current trucks. Five or six hours is about the limit for what's on the road now before at least a fuel stop, if the driver keeps enough reserve to allow for going around the construciton detours and rerouting around accidents and weather affected routes. Of course on some US routes it's common to pull two (and rarely 3) trailers with a single tractor, and "robot trucks" will almost ineveitably lead to "trains" with more towed units. (The Army tested an 8-section "transport train" 50 years ago.) John
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