Manitoba Class 3 Drivers Licence Practice Test

'Snubbing' the brakes to control the speed of the vehicle down a grade should slow the vehicle by:

1. 8 km/h in three seconds

2. 10 km/h in five seconds

3. 5 km/h in two seconds

4. 15 km/h in four seconds

The correct answer is: 8 km/h in three seconds

"Snubbing" the brakes refers to a technique of applying and releasing the brakes repeatedly in order to slow down the vehicle. This method utilizes the kinetic energy of the vehicle to help in the braking process. Since the question mentions going down a grade, this is a situation where the vehicle is already moving at a higher speed and thus, it would take more time to come to a complete stop. Option A provides the slowest speed reduction out of all the options, and it would take three seconds to achieve that reduction. Options C and D suggest a faster speed reduction, which can be dangerous and cause the vehicle to lose control. Option B also suggests a relatively fast speed reduction in five seconds. This is why option A is the most appropriate and safest choice.