What effect does driving downhill have on your vehicle's speed?

Answer: B — Increase in speed

Driving downhill generally results in an increase in speed due to the force of gravity acting on the vehicle. When a vehicle descends a slope, gravity pulls it downward, causing it to accelerate. This natural tendency can lead to the vehicle gaining speed quickly if the driver does not take appropriate measures, such as using engine braking or applying the brakes. Understanding the dynamics of driving downhill is crucial for safe handling of the vehicle, as the increased speed can make it challenging to maintain control and stop when necessary. Drivers need to be aware of their vehicle's weight, the gradient of the hill, and the road conditions, as these factors all contribute to how much speed the vehicle will gain while descending.