I recently cycled some of the south coast of China. Some small towns there had roundabouts which served to slow traffic down but had a different pattern than we

I recently cycled some of the south coast of China. Some small towns there had roundabouts which served to slow traffic down but had a different pattern than westerners are used to. They drive on the right, but people who want to turn left would do so immediately, keeping the centre island on their right side. People turning right or going straight would use the roundabout the same as westerners. I also encountered a T junction with three lanes in each direction and traffic lights. When the lanes coming from the bottom had green lights they were one right and two left, and at the same time the rightmost lane coming from the right had a green light to go straight. Three inputs and three outputs, but sure surprised me. Traffic patterns are very local and often undocumented. Just like code.