Re: No bars? - because trucks have occasionally gotten their trailers stuck on a hump
Solution: Fix the humps. Or put warning and diversion signs around them.
Perhaps if the US put less effort into political infighting and more into infrastructure, the road fatality rate wouldn't be twice that of the UK (that is per vehicle kilometre, so is pretty directly comparable.) There have been big improvements in the US, but technological fixes like autopilots can only achieve so much; the actual infrastructure, vehicle design and driver regulation have to be addressed too.