A-road

noun

1. （英国）干线公路，A级公路（略次于高速公路，但较B级公路宽直）
   (in Britain) a road that is less important than a motorway , but wider and straighter than a B-road

1. A级公路;主干公路
   In some countries, an A-road is a major road. A-roads are narrower than motorways but are wider and straighter than B-roads.