Currently, traffic congestion problems in Vietnam's cities, especially in Hanoi and Ho Chi Minh city, are getting worse. Several solutions have been implemented to address this problem, including using separately lanes for cars and motorcycles were piloted in Hanoi. To evaluate #Ie effectiveness of this solution, the paper has discussed the issues of using separately lanes in lirban areas and its role in fighting urban traffic congestion. Based on the discus ion, the paper reviews the currently solution using separately lanes for cars and motorcycles on some streets in Hanoi and gives some recommendations for using separately lanes for cars and motorcycles in order to reduce traffic congestion in Hanoi as well as in other Vietnam's cities.