In rain, the braking distance required to stop your vehicle is significantly longer than in dry conditions. According to guidelines, including those referenced as Rule 126, in wet weather, stopping distances will be at least double those required for stopping on dry roads.
Why Does Rain Increase Braking Distance?
The primary reason for the increased stopping distance in rain is the reduction in grip between your vehicle's tyres and the road surface. Water acts as a lubricant, decreasing the friction needed for effective braking.
- Reduced Tyre Grip: Less friction means the tyres cannot slow the vehicle down as quickly, requiring a greater distance to come to a complete stop.
- Aquaplaning Risk: In heavier rain, a layer of water can build up between the tyres and the road surface, leading to aquaplaning, where the vehicle effectively skims on the water, resulting in a complete loss of steering and braking control.
Practical Advice for Driving in Wet Weather
Given that braking distances are substantially longer in rain, it's crucial to adjust your driving style to ensure safety.
- Increase Following Distance: As advised in the reference, you should keep well back from the vehicle in front. This provides a much larger buffer zone, increasing your ability to see hazards and plan ahead, giving you more time to react and stop safely given the longer braking distances.
- Reduce Speed: Driving at a slower speed reduces the energy that needs to be dissipated when braking, thereby shortening the stopping distance.
- Check Tyres: Ensure your tyres have adequate tread depth to help disperse water effectively and maintain grip.
Understanding that braking distances are at least double in rain is fundamental to safe driving in wet conditions. Adjusting your speed and increasing your following distance are simple yet effective ways to mitigate the increased risk.
