The mayor is trying to encourage more commuters to use mass transit in order to alleviate traffic in the city.市长正设法鼓励更多的上班族使用公交系统以缓解城市交通。The president wants to improve the nation's highways and mass transit systems.总统希望改善该国的公路与公共交通系统。The city has virtually no mass transit.这个城市几乎没有公共交通。An improved mass transit system would cut traffic on the roads.改进后的公共交通运输系统将减少道路的交通流量。