Theoretical Driving Course (TDC) Practice Exam

How far should red flag lights be visible to other drivers?

100 meters 50 meters 25 meters 75 meters

Correct Answer:

50 meters

Explanation:

Red flag lights are a warning for drivers behind a slow or stopped vehicle, so they need to be visible long enough for someone to notice, react, and slow down. About 50 meters provides a realistic warning window: you see the signal, your brain takes a moment to react, and your braking begins, giving enough space to slow safely before reaching the hazard. If the distance were only 25 meters, there isn’t enough time to react and brake smoothly. Distances like 75 or 100 meters are longer than usually necessary for typical speeds and can be impractical to maintain in everyday driving. In poor conditions, you should allow extra distance, but at standard conditions, 50 meters is the appropriate benchmark.

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