someone had to lead a car with a red

someone had to lead a car with a red

有些人拿着红色小旗引导车辆行走.
这个的上下文应该是介绍类似于交警还是协警的工作?

有人过一辆红旗

某个人必须要带领一台有红色旗帜的车。

必须得有人引领挂红旗的汽车。