This roundabout was built more than 30 years ago. At that time, there were fewer vehicles in Beijing than now, so it was very easy to walk around the island without traffic lights. At that time, the speed of vehicles passing around the island was very fast, and my home was nearby. Two of my neighbors were killed in Shihuan Island, and Dongzhimen Island also killed people.

However, this kind of roundabout is not suitable for the situation of large motor vehicle flow, and the quality of drivers in China is not high. When they bypass the roundabout, they don't follow the rule of "first out, then in", and they squeeze into the roundabout, and the more crowded they are, the more blocked they are. So a few years ago, traffic lights around the roundabout began to be controlled. Although sometimes there are no cars around the roundabout and vehicles in other directions can't go, it has the opposite effect, causing traffic jams in the east and west directions around the roundabout, but it is much better than blocking the roundabout. There are also many vehicles in Japan, but the traffic conditions there are much better, which is also related to the quality of people. For example, the traffic law stipulates that even if the traffic jam at the intersection ahead is a green light, vehicles at the rear can no longer enter the intersection. How many drivers can abide by it? Stop when the intersection is blocked.