Why do passenger vehicle drivers need to check their mirrors frequently while driving, beyond watching traffic?

Pick an answer

1. Only to check the mirrors themselves for cleanliness
2. Mirrors are only needed for parking
3. Passenger vehicles don't require extra mirror checks since they're large and visible, and other drivers are responsible for keeping clear of them
4. To watch for passengers moving in the aisle or trying to exit while the vehicle is moving

Correct!

Not quite. The correct answer is highlighted.