Should you rely on the parking brake alone while passengers board or exit at a stop on a slight grade?

Pick an answer

1. Yes, the parking brake alone is always sufficient regardless of the grade, since it's rated to hold the vehicle's full loaded weight
2. No, chock the wheels instead and never use the parking brake at a stop
3. No, keep the vehicle secured with the parking brake set and stay alert, since boarding on a grade adds risk if it were to slip
4. It only matters on grades steeper than what any bus route would use

Correct!

Not quite. The correct answer is highlighted.