How far must a car mirror allow a driver to see behind them?

How far must a car mirror allow a driver to see behind them?

• A. 200 feet
• B. 30 feet
• C. 100 feet
• D. 500 feet

Answer: (A)

Seeing far enough behind you is crucial for safe driving because it gives you time to notice and react to traffic that’s approaching from behind, especially when you’re changing lanes or adjusting speed. The required rear visibility is 200 feet, which at typical highway speeds corresponds to a bit over two seconds of travel. That margin helps you spot a tailgater or fast-moving vehicle in time to slow down or merge safely. Shorter distances, like 30 or 100 feet, wouldn’t give you enough warning, and 500 feet isn’t the standard practical expectation for typical mirror viewing capabilities. So, the best answer is 200 feet.

Seeing far enough behind you is crucial for safe driving because it gives you time to notice and react to traffic that’s approaching from behind, especially when you’re changing lanes or adjusting speed. The required rear visibility is 200 feet, which at typical highway speeds corresponds to a bit over two seconds of travel. That margin helps you spot a tailgater or fast-moving vehicle in time to slow down or merge safely. Shorter distances, like 30 or 100 feet, wouldn’t give you enough warning, and 500 feet isn’t the standard practical expectation for typical mirror viewing capabilities. So, the best answer is 200 feet.