On the open road with light traffic. Never use it in heavy traffic, when it is raining, or when there is ice or snow on the road.
You would use cruise control when driving on the open highway in very light traffic where you wish to maintain a constant speed.

It is true that signs and road markings are examples of traffic controls. Traffic controls include signal devices and signs that guide vehicle traffic and pedestrians.

To control the flow of traffic during construction, it's best to have signs posted for drivers to know what is coming up the road. Next, have cones to guide the traffic and an flag person ready to signal which flow of traffic can move.

The drivers of the vehicles comprising the traffic on the road guide this traffic, as the laws/rules of the road dictate.

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