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 California DMV knowledge test uses multiple-choice questions based on the Driver’s Handbook, and a passing score is 80%. 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: handheld use while driving is prohibited; adult drivers should use hands-free mode, while drivers under 18 may use a phone only for emergency assistance.

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:

California special speed limits: The limit is 15 mph at a blind intersection and in an alley. Vehicles towing trailers are limited to 55 mph, and a school zone may be posted as low as 15 mph.

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 the right-of-way in marked and unmarked crosswalks, and drivers must use caution and stop when necessary to let them cross safely.

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

Steep narrow mountain road: If two vehicles meet where neither can pass, the vehicle facing uphill has the right-of-way; the downhill-facing vehicle should back up until the uphill vehicle can pass.

3. Turns & Signal Laws

California requires a signal at least 100 feet before any turn, and at least 5 seconds 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 permitted and safe. Illegal where you cannot see 200 feet in each direction, on a one-way street, in business districts except at an intersection or a provided divider opening, at railroad crossings, in front of a fire station, 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 200 feet in the center left turn lane while preparing for a left turn or permitted U-turn. On a two-lane road where passing is unsafe, a slow-moving driver must use a turnout when five or more vehicles are following. A driver may enter a bicycle lane within 200 feet before a turn after checking for bicyclists. These rules are covered in the California Driver’s Handbook.

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 200 feet in the CTSL while preparing for a left turn or permitted U-turn.

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.

California HOV lane rule: Follow the posted occupancy requirement and use designated entrances and exits. The Clean Air Vehicle decal exemption ended on October 1, 2025, so a decal no longer allows a solo driver to use an HOV lane.

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.
• When passing a bicyclist, change lanes when possible. If you cannot change lanes, leave at least 3 feet of clearance; if 3 feet is not available, do not pass until it is.

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 covered in the California Driver’s Handbook, including 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.
• If the school bus is on the other side of a divided highway or a multilane highway with two or more lanes in each direction, traffic on the opposite roadway does not need to stop.
• If the bus is traveling on your roadway or in your direction of travel, you must stop while its red lights are flashing.
• 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 are among the vehicles required to stop before railroad crossings, so drivers should expect them to stop even when no train is immediately visible.

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 approaching a stationary vehicle displaying flashing hazard lights or another warning device, including emergency and highway-maintenance vehicles, move to a nonadjacent lane if safe or slow to a reasonable and prudent speed. Do not follow within 300 feet of an emergency vehicle using a siren or flashing lights.

8. Alcohol, DUI & BAC Laws

Californias DUI laws cover alcohol and drugs equally, cannabis included. Under 21? Your limit is 0.01%, essentially zero. A first refusal to complete a required chemical test results in a one-year suspension, 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 generally must be secured in an appropriate child restraint system in a rear seat. Children under 2 must be rear-facing unless they weigh at least 40 pounds or are at least 40 inches tall.

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 or fire station driveway
• Within 20 feet of the vehicle approach side of a marked or unmarked crosswalk, or within 15 feet where a curb extension is present
• Within 3 feet of a sidewalk ramp for disabled persons
• In the crosshatched area next to a designated disabled parking space
• On a sidewalk, in front of a driveway, or on a bridge
• Where a NO PARKING sign is posted or at a red curb; yellow curbs are for loading or unloading under posted restrictions
• 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 places traffic convictions and collisions on your driver record for 36 months or longer, depending on the type. Hit specific point thresholds within rolling time windows and you may be treated as a negligent operator, which can lead to probation or suspension.

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 requires low beams when windshield wipers are needed because of fog, rain, or snow. High beams must be dimmed within 500 feet of an oncoming vehicle or within 300 feet of a vehicle you are 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 prohibits drivers from holding and operating a handheld phone while driving. Adult drivers should use hands-free mode when necessary. Drivers under 18 may not use a wireless phone or electronic device while driving, even hands-free, except for emergency assistance.

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: looking at a phone or navigation system, changing music or volume, and grooming are examples of distractions listed by California DMV.

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.