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Topic 8 · Section 50

Weather and Natural Disasters

Sometimes, emergencies aren’t car-specific but environmental. Here’s how to respond safely:


🌫️ Heavy Fog

  • If fog is extremely dense, it’s safest not to drive.
  • If you’re caught in blinding fog, pull completely off the road and wait it out.

🌊 Flooding

  • Never drive through large or fast-moving water.
  • If water is rising around your vehicle, exit and move to higher ground if safe to do so.
  • Vehicles can be swept away in less than 2 feet of water.

🌎 Earthquake

  • If an earthquake hits while driving:
    • Slow down and pull over.
    • Avoid stopping under overpasses, trees, poles, or next to buildings.
    • Stay inside the car until shaking stops.
  • Afterward:
    • Watch for road damage, cracks, and falling debris.
    • Along the coast? Be alert for tsunami warnings. Move to high ground if advised.

🔥 Wildfire Smoke

  • Treat heavy smoke like dense fog.
  • Use recirculate mode on your A/C to avoid smoke inhalation.
  • Be ready for road closures or emergency detours.
  • Do not drive through active fire – turn around if safe.

💨 High Winds & 🌪️ Dust Storms

  • In zero visibility dust storms:
    • Pull off road, turn off lights, and wait it out.
    • Turning off lights prevents others from following and crashing into you.
  • In high winds:
    • Hold steering wheel firmly.
    • Watch for flying debris or falling branches.

🌪️ Tornado

  • Rare in California, but:
    • Do not try to outrun a tornado.
    • If no shelter:
      • Park, exit the vehicle, and lie flat in a ditch or low spot.
      • Stay away from the car in case it flips.
      • If staying in car, buckle up and keep below window level.

🪨 Avalanche or Rockslide

  • Watch for warning signs in mountain areas.
  • If rocks are falling:
    • Do not drive through – stop and assess.
  • In an avalanche:
    • Stop and avoid entering the area.
    • If caught in a slide, stay in the car if further slides are possible and call for help.

🛣️ Brake Failure on Downgrades

  • Use escape ramps (gravel runoff zones) on steep downhill roads.
  • Designed to safely stop vehicles with failing brakes – lifesavers for both trucks and cars.

🧘 Final Tip: Stay Calm

Remaining calm is your best tool in any emergency.

  • Panic causes mistakes.
  • If you’ve studied and mentally rehearsed these situations, you’re more likely to take the right actions under pressure.

Check you have it

105 practice questions cover emergencies and unforeseen situations, 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.

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