How much should you reduce your speed on wet roads?

Reducing your speed on wet roads by one-third is a recommended guideline because wet conditions can significantly increase stopping distances and reduce traction. When roads are wet, water creates a film between the tire and the pavement, often leading to hydroplaning if the speed is too high. Slowing down by a third helps ensure that you retain better control of your vehicle, allowing for safer stops and turns. It provides a buffer to account for the reduced friction, which can be crucial in preventing accidents. This cautious approach is particularly important for commercial drivers who operate larger vehicles that require longer stopping distances.