Traffic congestion is caused by commuters travelling to work. One of the main reasons for traffic jam is that the majority of people prefer using their own cars instead of public transportation means that they tend to travel alone. Because, public transportation is not reliable and efficient for them and with an increasing world population, the cars on the roads are also increased. Another factor is that most people live in the suburbs outside the city center and they tend to travel at the same time of day. Moreover, cars and road space are not used efficiently. As a result, this causes traffic jams during the rush hour.