What factor significantly increases stopping distance in wet conditions?

In wet conditions, the significant factor that increases stopping distance is reduced traction on the road. When the surface of the road is wet, the amount of friction between the tires and the road decreases. This lower friction means that the vehicle has less grip, which affects its ability to slow down or stop effectively when brakes are applied.

As traction diminishes, the tires can skid or slide, leading to longer distances required to come to a complete stop. This is crucial for drivers to understand, as it emphasizes the importance of adjusting driving behavior in wet conditions to ensure safety.

While speed can indeed influence stopping distance, the key element in wet weather is the traction loss rather than just speed alone. Visibility, while a critical factor in driving safety, does not directly impact the stopping distance. Lastly, vehicle weight can affect braking, but it is the reduced traction that most significantly influences stopping distance specifically in wet conditions.