Looking back to when I did 3 weeks in the states, their driving standards were truly awful. The 3 things that stood out to me were:
Speed limits seemed to be taken as advisory.
Zero lane discipline on highways, you can go any speed in any lane and no need to keep to the inside of you were not overtaking.
The maintenance standards of vehicles and the standard in general that applied to HGVs was awful.
HGVs had no side ‘skirts’ so vehicles could get pulled in under the trailer and mashed by the rear wheels. Pedestrians and cyclists would have no chance.
HGVs also seemed to have no lower speed limits, or if they did have one, it certainly wasn’t observed.
When you are doing 75 on a highway and getting overtaken by a 40T semi truck, you know something isn’t right with the regulations and no wonder they have so many deaths. Let’s not forget, even if it’s ‘only’ twice the U.K., the seriously injured that sits below that is going to be huge.
Not to mention insurance appears to be optional in some states so you could get bankrupted from medical bills relating to an injury from someone else crashing into you. Fun times.