How far in advance must you signal before changing directions?

Answer: D — 100 feet

You must signal at least 100 feet before changing directions. This distance allows enough time for other drivers and pedestrians to notice your intended move and react accordingly. Signaling well in advance is crucial for maintaining safety on the road, as it provides clear communication of your actions. This distance is particularly important in urban environments where traffic can be dense and unpredictable, as well as on highways where higher speeds are involved. Ensuring that others are aware of your maneuver can help prevent accidents and promote smoother traffic flow.