You may think that parking illegally on the sidewalk has nothing to do with traffic problems, but it does. If the pavements in Bangkok are full with vendors selling food or with parked cars, then the pedestrians have no choice but to walk on the road. This then leads to cars having to slow down or change lanes. The same goes for illegally parked cars. Other problems include people going through red lights when their exit is not clear, queue jumping when doing u-turns, buses dropping off passengers in the middle of the road, people constantly changing lanes and motorcycles driving everywhere including in the wrong direction.