Compared with the UK where I previously lived, the US has a large number of railway crossings in urban and suburban areas, full stop. So many of these would be a bridge or cutting in the UK. I used to live in a city where the train literally ran down the middle of the road. Secondly the marking is somewhat understated and can look confusingly similar to a regular intersection, many do not have barriers, and many are adjacent to or run through a road intersection with conventional lights, for added confusion. Finally, the US allows right-turn on red, so it’s normal to pass through a red light and make a turn.