Sharing the Road: Trucks, Buses, Light Rail, Motorcycles, Emergency Vehicles, Slow Vehicles, Bicycles and Work Zones

Written for aiforu2 as the source for a practice-test bank and the on-device tutor for the California Class C knowledge test. The facts follow the official handbook; the wording is ours.

Source: California Driver's Handbook (DL 600), California Department of Motor Vehicles, 2025 edition, section 7 "Laws and Rules of the Road", "Sharing the Road" (pp. 42–50).

Large vehicles and trucks

Truck drivers sit high with big mirrors, but they have large blind spots, the No Zones, where your car disappears: if you cannot see the truck's side mirrors, the driver cannot see you.

Braking: a passenger car at 55 mph stops in about 300 feet; a large vehicle at the same speed can need 400 feet, and a loaded truck needs more than an empty one. Trucks keep extra space ahead for sudden stops; never pull in front of one and slow or stop suddenly.

Turning: the rear wheels follow a shorter path than the front wheels, and the longer the vehicle the bigger the difference, so trucks swing wide. Before passing a truck, read its signals: it may seem to turn one way while swinging out the other way.

Maneuvering: on a divided highway with four or more lanes in one direction, trucks may use only the two right-hand lanes. Around trucks, do not change lanes directly in front of them to reach an exit, do not ride alongside longer than needed (always pass on the left, then move ahead), do not tailgate, and do not underestimate their size and speed; they look slower than they are.

Buses, streetcars, trolleys and light rail

Safety zones, marked by raised buttons or markers, are for people waiting for buses, streetcars and trolleys; never drive through one. When a bus, streetcar or trolley is stopped at a safety zone or a signal, you may pass at no more than 10 mph. Do not pass a light rail vehicle or streetcar on the left, moving or standing, unless the tracks are so close to the right side that you cannot pass on the right, you are on a one-way street, or an officer directs you.

Light rail vehicles have the same rights and duties as other vehicles. Know where they run (buildings and trees create blind spots for the operator), never turn in front of one, keep a safe distance, check for them before turning across the tracks, and complete the turn only when the signal allows, remembering that trains can interrupt the traffic lights.

Motorcycles

Riders have the same rights and duties as drivers. Check mirrors and blind spots for them when changing lanes or entering a road, since their small size hides them. Keep a three-second following distance in case a rider brakes hard or falls. Give a motorcycle the full lane when possible; lane splitting is legal in California, but never try to pass a motorcycle within the same lane. Check for riders before opening a door, and move to one side of your lane when you can to give them room to pass. Road conditions can make a rider change speed or direction suddenly.

Emergency vehicles

Yield to any law enforcement vehicle, fire engine, ambulance or other emergency vehicle using a siren and red lights: drive to the right edge of the road and stop until they have passed, or risk a ticket. If you are already in an intersection, go on through, then pull right and stop. Approaching a stationary emergency vehicle with flashing lights, move over and slow down. Obey any direction from an officer or firefighter even when it conflicts with signs, signals or laws. Do not follow within 300 feet of any emergency vehicle with its siren or lights on, and do not drive to the scene of a fire, collision or disaster; you can be arrested for getting in the way.

Slow-moving vehicles, NEVs and animals

Big trucks, bicycles and some cars lose speed on hills and take longer to get up to speed. Vehicles with the orange-and-red triangle on the back, such as road maintenance vehicles, usually travel at 25 mph or less. Scooters, golf carts and neighborhood electric vehicles also use public roads; NEVs and low-speed vehicles top out at 25 mph and may not use roads posted above 35 mph, so watch for NEV USE ONLY and NEV ROUTE signs. Horse-drawn vehicles and riders share the road, and scaring horses or livestock on purpose is illegal. Near an animal-picture sign, watch for animals; near livestock, slow or stop and follow the person in charge.

Bicycles

Bicyclists have the same rights and duties as drivers. They may ride on some freeway sections where no alternate route exists and bicycling is not forbidden, move left to avoid hazards, ride near the left curb of a one-way street, and use a crosswalk by stopping and crossing as a pedestrian. A rider slower than traffic must ride as close as possible to the right curb except when passing, preparing a left turn, avoiding a hazard, in a lane too narrow to share side by side, approaching a right turn, or on a one-way road with two or more lanes.

Bicyclist duties: obey signs, signals and right-of-way rules; ride with traffic; look over the shoulder before turning or changing lanes; yield to pedestrians; wear a helmet if under 18; stay visible and never weave between parked cars; ride near the right curb; no sidewalk riding unless the city allows it; turn as drivers do with hand signals and turn lanes; use a bike lane when possible, or a through lane; and keep working brakes. At night: a white front lamp visible from 300 feet; a red rear reflector, solid red light or flashing red light visible from 500 feet; white or yellow reflectors on each pedal, shoe or ankle visible from 200 feet; and a white or yellow front-wheel reflector, a white or red rear-wheel reflector, or reflective tires.

Passing a bicyclist: change lanes if you can and return afterwards. When you cannot, leave at least three feet, and if you cannot give three feet, do not pass until you can. Give room so riders are not forced into parked cars or opening doors; merge toward the curb or into the bike lane only when safe; merge behind a bicyclist before turning; enter a bike lane no more than 200 feet before a turn; check for riders in your blind spots; and take care on two-lane roads.

Road workers and work zones

Signs and message boards announce workers, slow equipment and closed lanes. Slow down, leave extra space, expect sudden stops, watch for lane changers and avoid distractions. Cones, drums and barriers guide you; merge as soon as it is safe without crossing them, watch for bicycles where the shoulder is closed, and obey flaggers. Work-zone fines can be $1,000 or more; assaulting a highway worker brings up to $2,000 and a year in jail. Fines double in Safety Enhanced-Double Fine Zones and in construction or maintenance zones when workers are present.

Move over and slow down for stationary emergency vehicles and tow trucks showing flashing amber lights and for stopped road-work vehicles with emergency or amber lights.

Hazardous loads

A diamond-shaped placard on a truck means a dangerous load such as gas or explosives. Those vehicles must stop before crossing railroad tracks, as must buses and school buses.

Practise this with California Driver License questions

More of this guide