California DMV Traffic Signals and Signs

A solid red signal means stop. Stop behind the limit line; if none, before the crosswalk; if none, before entering the intersection. A right turn on red is generally permitted only after a complete stop, when no sign prohibits it, and after yielding to pedestrians, bicyclists, and conflicting traffic. A red arrow is stricter: California DMV instructs drivers not to turn in the arrow’s direction until a green signal or green arrow appears.

A flashing red signal also means stop, then proceed when safe under right-of-way rules. Treat each approach like a stop-sign control. If several vehicles arrive, sequence by arrival and yield right when arrival is simultaneous, while protecting pedestrians. A dark or failed traffic signal is handled as an all-way stop unless an officer or other traffic control directs differently.

Never follow the vehicle ahead through without independently observing the indication and intersection. A large vehicle may hide the signal or a pedestrian. Keep enough distance to see and stop. If a police officer, firefighter, flagger, or other legally authorized person directs traffic contrary to the normal signal, follow the lawful direction carefully; the human control is managing a condition the signal may not reflect.

A solid yellow light warns that red is about to appear. Stop if you can do so safely. If you are too close to stop without abrupt braking or entering danger, cross cautiously. Do not accelerate to “beat” the red. The decision should be based on distance, speed, surface, traffic behind, and intersection clearance—not habit. Never enter if congestion prevents the vehicle from clearing the intersection.

A yellow arrow means the protected turning phase is ending. If you can stop safely, stop; if already committed or unable to stop safely, complete the movement cautiously and prepare for the next indication, which may be a red arrow or another signal. A flashing yellow light does not require a stop by itself, but it requires slowing, heightened observation, and cautious progress.

A flashing yellow arrow allows a turn but does not protect it from opposing traffic. Yield to oncoming vehicles, pedestrians, and bicyclists and turn only with a safe gap. Do not confuse it with a green arrow, under which opposing traffic is stopped by red. Even with a green arrow, scan for a person or vehicle still in the path. Signal color assigns movement; it cannot physically clear the intersection.

A solid green light means go when the path is clear. Yield to vehicles, bicyclists, and pedestrians already in the intersection. A driver turning left on a solid green must yield to oncoming traffic close enough to be dangerous and to people crossing. Do not enter an intersection unless enough space exists to clear it. Blocking the intersection after the light changes creates cross-traffic conflict and may result in a citation.

A green arrow authorizes a protected movement in the arrow’s direction because opposing vehicle traffic is stopped. It does not guarantee that a pedestrian ignored a signal, an emergency vehicle is absent, or the receiving lane is open. Look through the complete turning path before moving. When the arrow ends, obey the next indication rather than following the vehicle ahead from memory.

At every green, search left, ahead, right, and through the intended path. A newly green signal is a high-risk moment because a late vehicle may enter from the side. Pause long enough to confirm without delaying unnecessarily. Horn pressure from behind does not make an unseen area safe. If an emergency vehicle approaches with required warning equipment, yield even when your light is green.

A WALK symbol or walking person permits a pedestrian to begin crossing. A steady DON’T WALK or raised hand means a pedestrian should not start. A flashing raised hand means do not begin crossing; the countdown shows time remaining for people already crossing. Drivers must continue yielding to pedestrians even when the raised hand is flashing. Never use a countdown as permission to rush a turn before someone reaches the curb.

Some intersections permit diagonal crossings during an exclusive pedestrian phase. Vehicles must remain stopped while people cross in multiple directions. Accessible signals may use tones, chirps, vibration, or spoken information for blind or visually impaired pedestrians. Do not honk at a person using a white cane or guide dog; they have right-of-way and may depend on vehicle sound to understand the scene.

When no pedestrian signal exists, pedestrians follow the vehicle signal. Drivers still must recognize marked and unmarked crosswalks. A warning beacon or flashing crosswalk light increases visibility but does not create the pedestrian; search whether it is active or not. Stop behind the limit line and leave the entire crosswalk available. A vehicle stopped at a crosswalk may be hiding a person, so never pass it.

A red octagonal STOP sign is recognizable by shape even when partly obscured. Make a complete stop at the correct line or boundary, search all directions, yield, and proceed only when safe. A triangular red-and-white YIELD sign requires slowing and readiness to stop; stop whenever necessary to give priority. An inverted triangle’s unique shape helps recognition from the back or in poor visibility.

White rectangular signs commonly communicate enforceable rules such as speed limits, lane use, turn restrictions, and parking controls. A posted speed is a maximum under favorable conditions, not a required target. A red circle and diagonal slash prohibit the pictured movement. NO TURN ON RED removes the otherwise possible red-light turn at that location. Read supplemental plaques for times, vehicle classes, arrows, or distances.

DO NOT ENTER marks a roadway or ramp that must not be entered from that direction. WRONG WAY confirms travel against the authorized flow. If you discover a wrong-way entry, do not continue searching for an exit at speed. Reduce speed, signal, stop in the safest available place out of traffic if possible, activate warnings, and turn around or back out only when the path can be confirmed. At night, red reflectors facing you can also warn that your direction is wrong.

Diamond-shaped signs usually warn of conditions ahead. Their job is to create preparation time: release the accelerator, increase space, choose a lane, or cover the brake before the hazard appears. TRAFFIC SIGNAL AHEAD may mean a hidden signal or stopped queue. MERGE and LANE ENDS require early gap planning. A winding-road symbol calls for a safe entry speed and continued lane control, not braking sharply in each curve.

SLIPPERY WHEN WET warns that normal speed or steering may exceed available traction. Slow before the wet section and avoid sudden input. LOW CLEARANCE requires comparison with the vehicle’s true maximum height, including cargo, racks, air-conditioning units, or raised equipment. If clearance is uncertain, stop before committing and choose another route.

A pentagon warns of a school area or crossing. Reduce speed as required and search for children, crossing guards, and stopped school buses. Pedestrian and bicycle symbols identify likely crossing activity, not the only place those road users may appear. Warning signs do not grant right-of-way or guarantee the hazard is currently visible; they tell the driver to create time and space for uncertainty.

A round yellow railroad warning sign or crossbuck identifies a rail crossing. Slow, look, listen, and prepare to stop. Flashing red lights, bells, or a lowered gate mean stop and wait. Never drive around a gate. Cross only when the controls permit, no train is approaching, and enough space exists on the far side for the entire vehicle. Do not shift unnecessarily or stop on the tracks.

A blue emergency-information sign at many crossings provides the railroad contact and crossing identification. If a vehicle stalls on the tracks, occupants should exit immediately, move away from the tracks in the direction from which a train is approaching to avoid debris, call 911, and use the posted emergency number when possible. The dedicated roadway-laws lesson develops this emergency further.

Orange signs, cones, drums, arrow boards, and flaggers mark temporary work-zone control. Slow, increase following distance, expect lane shifts and sudden stops, and obey the flagger. Temporary markings and devices may redirect traffic across ordinary lane lines. Never cross cones or drive into a closed lane because equipment is not visible. Fines and risks may increase, but the essential reason for compliance is protecting workers and road users in a narrow, changing environment.

Use a four-part method: identify, interpret, prepare, verify. Identify color, shape, symbol, text, arrow, and flashing pattern. Interpret the specific rule or warning. Prepare by adjusting speed, lane, following distance, or stopping position. Verify the live path for people, vehicles, trains, and available space. This prevents correct recognition from becoming an unsafe automatic response.

Guide signs—commonly green for destinations, blue for motorist services, and brown for recreation or cultural interest—help navigation but do not replace regulatory controls. Route shields identify highway systems; arrows and distances help early lane choice. A changeable message sign may warn of collisions, closures, weather, or lane use. Read it in brief glances and obey any enforceable instruction.

Consider three examples. A green light appears but traffic blocks the far side: remain behind the line. A yellow diamond shows lane ending: signal and choose a safe gap before the taper. A STOP sign is partly covered by a branch but its red octagonal shape is visible: make the required stop. Professional sign reading connects recognition to space and right-of-way, while remaining ready for conditions the sign cannot show.