California Driving Laws 2026: Speed Limits, DUI BAC and DMV Permit Test Road Rules

What is the default speed limit in California when no sign is posted in a residential area? California sets 25 mph in business and residential districts by law. The DMV written test is 46 questions for adults (36 for teens); you need 83% to pass. California has a Basic Speed Law: you can be cited for driving too fast for conditions even below the posted limit. DUI threshold is 0.08% for adults, 0.01% for under-21. Cell phones: complete hands-free requirement, no holding the phone under any circumstances.

1. Speed Limits in California

California uses the Basic Speed Law, you must never drive faster than is safe for conditions, regardless of the posted limit. On top of that, specific statutory limits apply by zone type when no other sign is posted:

Key test point: Californias Basic Speed Law means you can be cited for driving too fast even if you are under the posted limit, if conditions do not support that speed. Fog on the coast, wildfires reducing visibility, or wet mountain roads all require slowing down regardless of what the sign says.

2. Right-of-Way: Who Goes First

Californias DMV test hits right-of-way questions hard, pedestrian crossings, blind intersections, and freeway merges are all tested. The golden rule: right-of-way is something you yield, not something you demand. Pedestrians have it almost everywhere.

4-way stop (all arrive at once)

Driver to the right

4-way stop (one arrives first)

Driver who arrived first

Roundabout / traffic circle

Vehicles already inside the circle

Emergency vehicles (lights/siren)

Emergency vehicle, pull to the right and stop

Pedestrians in crosswalk

Pedestrians always

T-intersection (no signs)

Through road traffic; drivers on the dead-end must yield

Yield sign

Cross traffic and pedestrians always

Merging onto a highway

Traffic already on the highway

3. Turns & Signal Laws

California requires a signal at least 100 feet before any turn, and 5 seconds (about 400 feet) before a freeway lane change. Right turns on red are generally permitted after a full stop. Heres how every turn and intersection scenario plays out:

Right turn on red

Permitted after a full stop unless a sign prohibits it. Yield to pedestrians and cross traffic.

No right turn on red

When posted, you must wait for a green light before turning right.

Left turn on red

Only allowed from a one-way street onto another one-way street, after a full stop.

Left turn from two-way street

Start from the left lane; end in the left lane of the cross street.

Right turn

Stay as close to the right curb as possible; end in the right lane.

U-turns

Legal where not prohibited by a sign; must not interfere with traffic. Illegal where you cannot see 200 feet in each direction, on a one-way street (unless turning from the far left lane), in business districts unless at an intersection, or where a sign prohibits it.

4. Lane Rules & Carpool Laws

California has some lane rules you will not find in other states, including strict carpool (HOV) lane restrictions and the two-way left turn lane. You may only travel up to 300 feet in the center left turn lane before making your turn. These rules are tested regularly on the DMV exam.

Center turn lane (CTSL)

Used only to begin or complete a left turn; not for through travel or merging. You may travel no more than 300 feet in the CTSL.

Solid white line

Do not cross; marks the edge of the road or a lane that should not be changed.

Solid yellow line (your side)

No passing allowed.

Broken yellow line

Passing allowed when safe.

Solid + Broken yellow centerline

Passing allowed only on the broken-line side.

5. Passing Another Vehicle

California sets firm limits on when and where you can pass. On two-lane mountain roads through the Sierra Nevada and Coast Ranges, passing misjudgments are fatal. Heres what the law says:

• Only pass on the left, using the oncoming lane, when it is safe and legal.
• Do not pass within 100 feet of an intersection, bridge, tunnel, railroad crossing, or curve where your view is limited. A full city block is about 300 feet, a half block is about 150 feet.
• The vehicle being passed must not speed up while you are overtaking.
• Return to your lane before coming within 200 feet of oncoming traffic.
• Never pass a stopped school bus with flashing red lights, this applies in both directions on undivided roads.
• You may pass on the right only when the vehicle ahead is turning left and there is a usable lane to the right.

6. Following Distance

LA and Bay Area traffic means you are constantly adjusting following distance, stop-and-go on the 101 is one thing, but wet roads, dense fog on the coast, and sudden speed changes on freeways all demand more space. The 3-second rule is your minimum baseline under normal conditions.

7. School Buses & Emergency Vehicles

Californias school bus stop rules are tested on every DMV exam, especially the divided highway exception. Get this wrong on the road and you are looking at a fine up to $1,000 and a possible one-year suspension.

School Buses

• When a school bus stops with flashing red lights and an extended stop arm, all traffic in both directions must stop on undivided roads.
• On roads with a true median or physical barrier, only traffic behind the bus must stop, oncoming traffic may proceed.
• A center turn lane does not count as a divider. On 4+ lane roads without a raised median or barrier, all directions must stop.
• You must remain stopped until the red lights stop flashing and the stop arm is retracted.
• California penalty for illegally passing a stopped school bus: fine up to $1,000 and driving privilege may be suspended for one year.
• Railroad crossings: School buses must stop at ALL railroad crossings, with or without passengers, even if no lights are flashing and no train is visible. This is a frequently tested rule.

Emergency Vehicles

• When you see or hear an emergency vehicle (police, fire, ambulance) with lights or siren: pull to the right edge of the road and stop. Do not block intersections.
• Move Over Law (California): When passing a stopped emergency vehicle, tow truck, or Caltrans vehicle with flashing lights on a multi-lane road, move one lane away if safe. If you cannot change lanes, slow to a safe and reasonable speed.

8. Alcohol, DUI & BAC Laws

Californias DUI laws cover alcohol and drugs equally, cannabis included. Under 21? Your limit is 0.01%, essentially zero. Refusing a chemical test costs you your license on the spot for a year, and every DUI conviction stays on your record for 10 years.

9. Seat Belts & Child Seats

In California, the driver is on the hook for any unbelted passenger under 16. Children under 8 must be in a child restraint system in the rear seat, and children under 2 must be in a rear-facing seat. No exceptions.

10. Where You Cannot Park

California adds some location-specific rules, including a ban on freeway parking except during emergencies, and designated EV charging spaces. Know these distances cold for the DMV test. You cannot park:

• Within 15 feet of a fire hydrant
• Within 20 feet of a crosswalk at an intersection
• Within 30 feet of a stop sign, yield sign, or traffic signal
• Within 50 feet of a railroad crossing
• On a sidewalk, in front of a driveway, or on a bridge
• In a no-parking zone or alongside a curb painted yellow or red
• Double parking (alongside a vehicle already parked at the curb)
• Headed downhill: turn wheels toward the curb. Headed uphill with a curb: turn wheels away from curb. Uphill without a curb: turn wheels toward the shoulder.

11. Driving in Bad Weather

Californias weather extremes range from dense tule fog blanketing the Central Valley to sudden downpours on coastal highways to ash and smoke from wildfires. Each creates a different driving hazard, and the DMV handbook addresses them all.

• Headlights required (low beam) whenever windshield wipers are in use due to fog, rain, or snow, California law is explicit on this point.
• In heavy fog, use low beams, high beams reflect off fog and reduce visibility.
• If you start to hydroplane, ease off the gas gently. Do not brake hard or turn sharply.
• In icy conditions, brake gently well in advance. Start slowing earlier than normal. Leave extra following distance.
• If your car goes into a skid, steer in the direction you want the front of the car to go. Do not overcorrect.
• Never use cruise control on wet, icy, or slippery roads.

12. Points & License Suspensions

California DMV tracks every moving violation conviction on your permanent record. Hit specific thresholds within rolling time windows and you become a negligent driver, which means probation, suspension, or revocation. Traffic convictions stay on your record for at least 36 months.

Note: For a one-point traffic violation, a judge may allow you to attend Traffic Violator School to keep the citation off your insurance record (once every 18 months). The point still stays on your DMV record.

13. Headlight Rules

Californias headlight rule has a detail that surprises many test-takers: if your windshield wipers are on due to fog, rain, or snow, your low-beam headlights must also be on. The dimming distances are also tested every time, 500 feet oncoming, 300 feet following.

Key test point: Oncoming = dim at 500 feet. Following = dim at 300 feet. And do not forget: wipers on = low beams on. That last rule trips up a lot of California DMV test-takers.

14. Night Driving

Californias overnight highways, the 5 through the Central Valley, the 101 along the coast, desert stretches of the 15, combine fatigue risk, glare, and wildlife crossings. The DMV handbook flags "Highway Hypnosis" specifically as a California night driving danger.

15. Cell Phones & Distracted Driving

California bans all handheld phone use while driving, and has since 2008. Texting, holding your phone to your ear, even glancing at a notification, all illegal. Drivers under 18 may not use any wireless device while driving, hands-free included.

Key test point: California bans all handheld device use for adults, not just texting. Drivers under 18 cannot use any wireless device at all, even hands-free. Also: fastening a seat belt, eating, or adjusting the radio while driving are all cited in the DMV handbook as distractions.

16. Railroad Crossings

California specifies a unique speed rule near crossings, slow to 15 mph within 100 feet if you cannot see the tracks clearly for 400 feet in both directions. The stop distance rule and school bus requirement are both on the DMV exam.

Key test point: Never drive around or under a lowered crossing gate, it is illegal and extremely dangerous. Wait until gates are fully raised and all tracks are clear.

17. How to Drive a Roundabout

Roundabouts are increasingly common in Californias newer suburban developments and on state highway redesigns. The DMV tests them directly. One rule dominates every question: entering drivers yield, always, to vehicles already circulating inside.

Key test point: The most common wrong answer on roundabout questions is thinking you have right-of-way when entering. You never do, yield to traffic already inside.