If you're in the US you probably don't have to go to Europe to experience this. Just go to another state. Despite federal standards there's a lot if variation in traffic signage, road markings, lane widths, and allowances.

Many regions of Michigan, for example, do not have left turn lanes. You're expected to make a right and then a U-turn.

I work in San Diego, but my employer is in Buffalo, NY. After spending a few weeks driving in Buffalo I've quickly come to appreciate how much thought has gone into SoCal's roads. The smart lights alone make me never want to leave the region.