Legally, how far must a car mirror allow a driver to see behind them?

The requirement for car mirrors to allow a driver to see behind them is based on safety regulations aimed at ensuring good visibility while driving. In the context of the question, the correct answer indicates that a car mirror must provide a view that enables a driver to see vehicles or obstructions at least 200 feet behind the car. This distance is significant because it allows the driver to monitor their surroundings effectively, helping them make safer decisions, such as changing lanes or backing up. The visibility afforded by the mirrors plays a crucial role in preventing accidents and ensuring that drivers can respond appropriately to the presence of other vehicles or hazards behind them. This requirement reflects the importance of adequate rear visibility as part of safe driving practices.