While motorcyclists blame automobiles for causing traffic congestion, car drivers complained about the poor awareness of motorcyclists of traffic laws.
Poor transport infrastructure, unsynchronized planning, and poor awareness of traffic law have been problems for Hanoi traffic for years. 
The rapid increase of private cars is another reason.
The development of new residential areas is part of the cause.

According to the Hanoi Traffic Police, by September 2015, the city had 535,000 cars.

Many universities and hospitals are still located inside the city.
Traffic in Hanoi and HCM City is a nightmare for foreign tourists. 
Poor awareness of traffic rules is a big problem.