By the ChowChow Labs editorial team · Updated November 6, 2026 · How we check our content
The Basic Speed Law
Legal rule
The posted number is a ceiling, not a target. California law requires a speed that is safe for the visibility, weather, traffic and road surface. You can be cited for driving at the limit if conditions call for less.
Example: Fog hides the curve ahead on a 55 mph road. You drop to a speed that lets you stop within what you can see.
Check the official wording in the California Driver Handbook.
Keep a space cushion
Safety recommendation
Leave at least three seconds between you and the car ahead, and more in rain, at night or behind motorcycles and large vehicles. Count from when the car ahead passes a fixed object.
Example: The van ahead passes a sign. You count 'one thousand one…' and reach the sign at three. Good gap.
Check the official wording in the California Driver Handbook.
Lights in fog, rain and at night
Legal rule
Use low beams in fog, rain and dust; high beams bounce back as glare. On dark roads use high beams, but dim them when you're within 500 feet of an oncoming car or 300 feet of a car you're following.
Example: Driving through a cloud bank on Highway 1, you switch to low beams and slow down.
Check the official wording in the California Driver Handbook.
Seat belts and child seats
Legal rule
Everyone in the car must be properly buckled. Children need the right car seat or booster for their age and size, installed correctly, until the adult belt fits them.
Example: A friend's 6-year-old is riding with you. You borrow and install a booster seat before leaving.
Check the official wording in the California Driver Handbook.
Check yourself
Try these 6 questions from our free mock exams, then tap Show answer. For more, take the rules of the road practice test.
Question 1 · Safe Driving and Hazards
An oncoming vehicle approaches while you are using high beams. What should you do?
- A. Leave them on until the other driver dims theirs first, then switch to low beams.
- B. Dim high beams for nearby oncoming or leading vehicles as required.
- C. Keep high beams aimed at the other driver.
- D. Switch off all headlights.
Show answer
Answer: B. Dim high beams for nearby oncoming or leading vehicles as required.
High beams can dazzle other drivers. Use low beams when approaching or closely following traffic.
Question 2 · Safe Driving and Hazards
Fog makes the next bend hard to see although the speed-limit sign has not changed. How should you choose your speed?
- A. Keep to the number on the sign in any weather.
- B. Match the fastest vehicle.
- C. Ignore visibility if the road is familiar.
- D. Pick a speed that keeps you in control for the visibility, surface and traffic around you, even if it is under the posted number.
Show answer
Answer: D. Pick a speed that keeps you in control for the visibility, surface and traffic around you, even if it is under the posted number.
California's Basic Speed Law makes the conditions, not just the sign, set your top speed. You can be cited for going the posted limit if fog, rain or crowds make that unsafe.
Question 3 · Safe Driving and Hazards
A passenger leaves the shoulder belt behind their back for comfort. What should happen before you drive?
- A. Skip restraints for a short trip.
- B. Let them wear the shoulder belt behind their back.
- C. Share one belt between two people.
- D. Make sure the required occupants are properly restrained before driving.
Show answer
Answer: D. Make sure the required occupants are properly restrained before driving.
Proper restraints reduce injury risk. Trip length does not make incorrect belt use safe.
Question 4 · Safe Driving and Hazards
A visiting child is too small for an adult belt to fit correctly. What should you arrange?
- A. Use the adult seat belt, adjusting the shoulder strap so it sits below the child's neck, and put them in front.
- B. Assume the front seat is always safest.
- C. Use a correctly installed restraint appropriate to the child and current California requirements.
- D. Let an adult hold the child.
Show answer
Answer: C. Use a correctly installed restraint appropriate to the child and current California requirements.
Child restraint choice depends on applicable age, size and installation requirements; an adult’s arms are not a restraint.
Question 5 · Safe Driving and Hazards
The vehicle ahead brakes suddenly on a damp road. What preparation best reduces your collision risk?
- A. Stay exactly one car length behind at every speed, so other drivers can't cut in.
- B. Leave enough time and distance to react safely.
- C. Follow closely to prevent merging.
- D. Watch only the lead car’s bumper.
Show answer
Answer: B. Leave enough time and distance to react safely.
Following space should allow a safe response to sudden changes; increase the margin when conditions worsen.
Question 6 · Safe Driving and Hazards
A busy shopping street has parked cars, driveways and crossing pedestrians. How should you use your eyes?
- A. Keep your eyes fixed on the lane markings just ahead of your car so you stay centered.
- B. Let navigation replace observation.
- C. Shift your attention regularly between the road far ahead, your mirrors and both sides.
- D. Watch only the car immediately ahead.
Show answer
Answer: C. Shift your attention regularly between the road far ahead, your mirrors and both sides.
Moving your eyes every couple of seconds lets you spot a door opening, a child stepping out or a car backing out early enough to respond.
Next: Alcohol, Drugs and Distraction. Alcohol, medicines, phones and drowsy driving.