Rule 227
Wet weather. In wet weather, stopping distances will be at least double those required for stopping on dry roads (see ‘Typical stopping distances’ ). This is because your tyres have less grip on the road. In wet weather you should keep well back from the vehicle in front. This will increase your ability to see and plan ahead if the steering becomes unresponsive, it probably means that water is preventing the tyres from gripping the road. Ease off the accelerator and slow down gradually the rain and spray from vehicles may make it difficult to see and be seen be aware of the dangers of spilt diesel that will make the surface very slippery (see Vehicle maintenance, safety and security ) take extra care around pedestrians, cyclists, motorcyclists and horse riders.