RainNew Zealand
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195. Rain
Rain can reduce visibility, tyre grip and vehicle control while increasing stopping distances. Water on the road can also cause aquaplaning, where the tyres lose contact with the road surface. Drivers should reduce speed, increase their following distance, avoid sudden steering or braking and use the appropriate lights when visibility is reduced. Extra care is needed during heavy rain and when water collects in wheel tracks or on poorly drained roads.
How does rain affect driving?
Rain can reduce visibility and tyre grip, increase stopping distances and make it more difficult to control the vehicle safely.
What is aquaplaning?
Aquaplaning occurs when a layer of water builds up between the tyres and the road, causing the tyres to lose contact with the road surface and reducing steering and braking control.
How should you drive in heavy rain?
Reduce speed, increase your following distance and use smooth steering, acceleration and braking. Use the appropriate lights and be prepared for reduced visibility and standing water.
Why should you increase the following distance in rain?
Wet roads can increase the distance needed to stop. A larger following distance gives you more time and space to react safely.
What should you do if the vehicle starts aquaplaning?
Remain calm, ease off the accelerator and avoid sudden braking or steering. Make smooth corrections until the tyres regain contact with the road.
Should you use headlights in rain?
Lighting requirements vary between countries. Drivers should use the lights required by local traffic rules whenever rain or other conditions reduce visibility.

Traffic rules
New Zealand