Traffic jam is the biggest problem in Bangkok. Bangkok is world renowned for its terrible traffic problems, so getting around on the roads is a bit of a nightmare. There are all kinds of vehicles that crosses the streets may become a real adventure. In my opinion, there are 3 main causes of Bangkok traffic jam problems.
First, metropolis has traffic jam. For example, on Silom road on every morning it is traffic jam. On Silom road there are many traffic polices, but it still has traffic jam.
Second, quality of transportation is low. Bus is low quality so it breaks down on the road such as mini buses. That makes a cause of traffic jam. Moreover, the BTS and MRT are not enough for users.