freeway mainline control

例句：

1. 1.The freeway mainline control system is responsible for monitoring traffic flow on the highway.
   高速公路主线控制系统负责监控高速公路上的交通流量。
2. 2.The engineers are working to improve the freeway mainline control system.
   工程师们正在努力改进高速公路主线控制系统。
3. 3.The freeway mainline control system is crucial for ensuring safe and efficient transportation on the highway.
   高速公路主线控制系统对于确保高速公路上安全和高效的运输至关重要。