traffic descriptor

例句：

1. 1.The traffic descriptor is a key factor in determining the speed limit on the road.
   交通描述符是确定道路限速的关键因素。
2. 2. The traffic descriptor helps to identify the most congested areas of the city.
   交通描述符有助于识别城市的最拥堵区域。
3. 3. The traffic descriptor system is designed to improve traffic flow and reduce accidents.
   交通描述符系统旨在改善交通流和减少事故。