Which color indicates you should stop at the stop line?

• A. Red
• B. Amber
• C. Green
• D. Flashing red

Answer: (D)

A flashing red signal is treated as a stop signal. When you see a flashing red, you must bring your vehicle to a complete stop at the stop line and only proceed when it is safe to do so (typically when the signal stops flashing or when you are given the go-ahead). This is why flashing red is the best answer here—it requires a full halt just like a steady red, and you only move once it’s safe. Amber means you should prepare to stop and may be required to stop if you can do so safely, green means go if the road is clear, and flashing amber is a caution signal rather than a definite stop.