After weeks without rain, oil and dust build up on the road. The first rain mixes with them and makes pavement slick. Stopping distances grow, and rear-end collisions rise. Slow down and leave more space.
Key takeaways
- First rain is slipperiest.
- Increase following distance.
- Check tires and wipers beforehand.
What the first rain does
Water lifts a film of oil and rubber dust. The surface becomes slick before runoff clears it.
Where it bites
Stop-and-go roads like El Camino Real and Homestead Rd are especially risky, as are freeway off-ramps.
How to drive
Add several seconds of following distance. Brake early and smoothly. Avoid sudden lane changes.
Prep your car
Check tire tread and pressure, wipers and brake lights.
If you are hit
Photograph the scene, exchange information and get an estimate. Rear damage can be hidden.
Why the first rain is different
After a dry stretch, the road surface holds a film of oil, rubber particles and dust. Light rain loosens it without washing it away. The surface becomes slick in a way that heavier, longer rain cleans up. This is why the first rain often produces more crashes than later storms.
Worn tires and old wipers add to the problem. Tires with shallow tread push water poorly, and streaky wipers cut visibility.
Driving adjustments that help
Leave more distance, brake earlier and smoother and avoid abrupt steering. Turn on headlights, since the combination of rain, glare and shadows makes cars harder to see. Keep extra space at stop-and-go intersections along El Camino Real.
Before the season, check tread depth with a penny test, replace wiper blades and make sure brake lights work. If you are rear-ended, photograph the scene and call for an estimate. Rear damage can hide behind a clean bumper, so our checklist for hidden damage helps you know what to look for.
Get a free estimate in Santa Clara
Questions about rear-end repair? Read our Rear-End Repair page, call (408) 243-2530, or send photos through the estimate form. International Auto Center Body Shop, 1499 Lincoln St, Santa Clara, CA 95050. Open Monday to Friday, 8:30 AM to 5:30 PM.
Frequently asked questions
Why is the first rain more dangerous?
Oil buildup on dry roads.
How much following distance do I need?
More than usual. Add seconds.
Does tire tread matter?
Yes, for wet grip.
Should I wait for rain to clear?
Not always, but be cautious.