aprobify.

Topic 4 · Section 52

Rain

⚠️ First Rain Caution

  • The first rain after a dry spell makes roads especially slick due to built-up oil — slow down considerably.

đź§˝ Wipers and Defrosters

  • Ensure wiper blades are in good condition — streaks impair visibility.
  • Use intermittent or low/high wiper settings as needed.
  • Turn on your defroster to prevent interior window fogging caused by rain humidity.

đź‘€ Visibility

  • If rain becomes very heavy, slow to a crawl or pull over if you can’t see.
  • On highways, use hazard lights if moving slowly, but ideally exit the road to wait it out.

🌊 Avoid Hydroplaning

  • Avoid deep puddles or slow down before hitting them.
  • Try to drive in the tracks of the vehicle ahead — they’ve displaced water.
  • If you start hydroplaning:
    • Ease off the gas
    • Don’t brake hard
    • Steer straight until traction returns

đźš« Deep Water Dangers

  • Never drive through water covering the roadway if:
    • It’s moving
    • You can’t gauge depth
  • As little as 6 inches of water can stall your engine
  • 12 inches can float a small car
  • Find another route if uncertain.

🛞 After Rain

  • Roads may remain slippery until fully dry — don’t assume it’s safe to speed just because the rain stopped.

Check you have it

179 practice questions cover defensive driving and safe driving practices, each explaining the reasoning behind its answer.

Practise this topic

Source: California Driver's Handbook (DL 600, rev. 6/2025). Edited by Fernando Aguilera. Aprobify is not affiliated with the California DMV.

Cookie preferences

Necessary

Required for the site to work: security, load balancing and remembering the choices you make here. These cannot be turned off.

Always

Analytics

Google Analytics 4. Tells us which pages people read and where the study material falls short. We look at it in aggregate, never to identify you.

Advertising

Measuring how well our ads work. We run no advertising tags on this site today; the category exists so that any we add later stays blocked unless you allow it.