When appropriate, how far in advance should a driver signal for a turn?

Answer: B — At least 100 feet before the turn

Signaling for a turn at least 100 feet in advance is crucial for ensuring safety on the road. This practice allows other drivers and pedestrians to be aware of your intentions well before you actually initiate the turn. By providing this early warning, other road users have enough time to respond appropriately, which can help prevent accidents. The 100-foot guideline is supported by traffic laws in many jurisdictions, promoting clear communication and predictability in traffic. It enhances safety by letting those behind you know that you are preparing to slow down and change direction, allowing for smoother flow and reducing the risk of rear-end collisions. Additionally, signaling well in advance is beneficial in complex traffic situations, such as busy intersections, where multiple vehicles and pedestrians may need to coexist safely.