In what scenario is it crucial to signal at least 200 feet ahead?

Signaling at least 200 feet ahead before changing lanes on a highway is crucial for several reasons related to safety and communication with other drivers. Highways typically involve higher speeds, and vehicles are traveling quickly; thus, giving ample notice of your intention to change lanes allows other drivers adequate time to respond accordingly. This can help prevent sudden moves that could lead to accidents.

Additionally, when you signal well in advance, you create a more predictable environment on the road. This predictability is key to maintaining traffic flow and safety, especially in areas where multiple lanes are present. By signaling 200 feet before making a lane change, you ensure that the drivers behind you can adjust their speed or position if necessary, thus minimizing risks and fostering better road etiquette.

In contrast, signaling before merging into traffic and entering roundabouts also requires communication with other road users, but the 200-foot signaling distance is particularly emphasized in the context of lane changes on highways due to the higher speeds involved. The importance of signaling before turning at lower speed limits is typically less critical, as the conditions allow for more immediate communication when speeds are slower.