It is evident that it can relieve the traffic congestion in the streets, thus accelerating the flow of buses and cars.

很明显，这样会缓解道路交通的拥挤，从而加快车速。

youdao

How to relieve traffic congestion in urban central area is becoming the key challenge requiring immediate action plans in large and medium cities.

如何缓解城市中心区交通拥堵是各大、中城市关注的焦点和亟须解决的问题。

youdao

Trains are fuel efficient, they relieve traffic and airport congestion and they also reduce our dependence on foreign oil, making passenger trains the safer,cleaner, greener transportation option."

VOA: standard.2010.02.15