If the light ahead is red, the driver is told the optimal speed to avoid stopping and idling.

如果前面的交通灯是红的，就会告诉司机一个最佳车速以避免停车和挂空挡。

youdao

If the light ahead is red, the driver is told the optimal speed to avoid stopping and idling.

如果前面的交通灯是红的，就会告诉司机一个最佳车速以避免停车和挂空挡。

youdao