a road that vehicles can use to avoid an area of heavy traffic, especially a road built for this purpose （交通高峰时减缓拥挤的）疏导路，旁道 It's part of the relief road system around the city. 它是城市周围救济路系统的一部分。 There is a detailed map showing where the new relief road is going to go. 有一张详细的地图显示了新的救济路的去向。 There were plans for an M4 relief road to the south of Newport. 计划在纽波特（Newport）南部修建M4救援路。