Which condition increases the distance a driver must take to stop their vehicle?

Driving on a wet road significantly increases the stopping distance required for a vehicle due to reduced traction between the tires and the road surface. When the road is wet, there is a layer of water that can cause the tires to hydroplane, resulting in less grip and a longer distance needed to come to a full stop. The vehicle's braking system becomes less effective, as the tires have a harder time making optimal contact with the slippery surface.

In contrast, driving on a dry road typically allows for better traction and shorter stopping distances. Lower speeds reduce both momentum and the distance needed to stop, and driving with an empty vehicle can affect weight distribution but does not generally lead to longer stopping distances compared to conditions involving wet roads.