The difference between US and UK crossings is that in the US, pedestrians and vehicles are directed to use the same bit of road at the same time. Cars turning right or left on a green light have to look to see if there are any pedestrians crossing, and give priority to them. Then the US also has that weird rule that allows you to drive straight through a red light, as long as you are turning right, which has visitors staring in disbelief.

In the UK/Europe, green means go and red means stop, without the above exceptions. In order to make this work, pedestrian crossings are often segmented, with individual signals for each section. There are a few junctions where all traffic is stopped for pedestrians, but that is pretty rare. Most junctions just allow pedestrians to cross on sections where traffic is not travelling.

UK/Europe also has a lot fewer crossroads than US. Since the cities are older, and do not as often have a grid structure, there are a lot more three-way junctions than crossroads, which actually makes crossing the road easier.