MO Road Signs Practice key terms

A sign that states a law, rule, or requirement drivers must obey, such as a speed limit, stop, or turn restriction. Regulatory signs are usually white with black or red legends and carry legal force.

A white rectangular regulatory sign showing the maximum lawful speed in miles per hour under normal conditions. It sets the legal limit; driving faster is a violation regardless of how the road feels.

A red octagon with white letters requiring a complete stop at the stop line, crosswalk, or edge of the intersecting roadway. The driver may proceed only after yielding to traffic and pedestrians with the right of way.

An inverted red-and-white triangle meaning the driver must slow down and give way to traffic on the intersecting road, stopping only if necessary. Unlike a stop sign, a full stop is not always required.

A sign that assigns a lane to a specific movement or vehicle type, such as left-turn-only, right-turn-only, or bus-only. Drivers must follow the assigned use or change lanes before the restriction begins.

A regulatory sign prohibiting or requiring a turn, such as no left turn, no U-turn, or mandatory right turn. These signs are often posted at intersections where turning would be unsafe or disrupt traffic flow.

A regulatory sign that limits or prohibits parking, standing, or stopping, often with times, days, or permit conditions. Ignoring it can lead to a citation or towing even when the restriction seems minor.

A yellow diamond-shaped sign alerting drivers to a change or hazard ahead, such as a curve, hill, or narrowing road. Warning signs do not state a law but tell drivers to adjust speed or position.

A yellow rectangular plaque mounted below a warning sign showing a recommended safe speed for the hazard, such as a curve or ramp. It is advice, not the legal speed limit, though exceeding it may be unsafe.

A yellow rectangular sign with a black chevron arrow used through sharp curves to show the direction of travel. A series of chevrons guides drivers through the curve, especially at night or in bad weather.

A yellow diamond warning sign with a curving arrow indicating a series of curves ahead. Drivers should reduce speed before entering the first curve rather than braking sharply inside it.

A yellow diamond warning sign showing that the roadway ahead becomes narrower, often because of a bridge, median, or lane drop. Drivers should check their lane position and avoid passing where space is limited.

A yellow diamond warning sign depicting a steep downgrade or upgrade, often paired with a percentage grade plaque. On long downgrades, drivers should use a lower gear to avoid brake overheating.

A yellow diamond warning sign showing a car with skid marks, indicating reduced traction on a wet surface. Drivers should slow down and avoid sudden braking or steering on such pavement.

A sign giving directional or navigational information, such as route numbers, destinations, distances, exits, and services. Guide signs are typically green, blue, or brown and help drivers plan their route rather than impose rules.

A sign displaying a highway number and its classification, such as an interstate shield or a state route shape. The shape and color identify the road system so drivers can follow a route across junctions.

The red, white, and blue shield-shaped marker for numbered interstate highways, with even numbers generally running east-west and odd numbers north-south. Mile markers and exit numbers on interstates usually follow milepost distance.

A green guide sign announcing an upcoming exit, often with the exit number, destination, and distance. Drivers should move into the correct lane well before the exit and avoid last-minute lane changes.

The number assigned to an interchange, usually based on the milepost where the exit ramp begins. Knowing the exit number helps drivers confirm they are approaching the correct interchange, especially in unfamiliar areas.

A blue guide sign showing available services such as gas, food, lodging, or hospitals, often with distance and direction. These signs help drivers plan stops without leaving the highway to search.

An orange sign warning of construction, maintenance, or utility work ahead, often with reduced speed or lane-closure information. Orange marks work zones because they demand extra caution and lower speeds.

A trained worker who controls traffic through a work zone using a stop/slow paddle or hand signals. Drivers must obey the flagger's directions, which override normal signs and signals in the zone.

A change in the path of travel through a work zone, often marked by orange arrows, cones, or temporary markings. Drivers should follow the shifted path at reduced speed and avoid drifting back to the old lane line.

A cone, drum, barricade, or tubular marker used to guide traffic and separate it from work areas or opposing lanes. These devices define the temporary path and should not be crossed or displaced.

The set of signs, signals, markings, and devices used to manage traffic through a work zone. It may temporarily override permanent signs and markings, so drivers must follow the orange devices and flaggers.

A sign marking an area near a school where speed limits are reduced during specified hours or when children are present. Drivers must watch for children, crossing guards, and posted reduced speeds.

A yellow-green diamond sign showing pedestrians, often with a downward arrow, marking a school crossing. The fluorescent yellow-green color is reserved for school, pedestrian, and bicycle warnings to increase visibility.

A warning sign indicating a crosswalk or pedestrian crossing ahead where drivers should expect people in the roadway. Drivers must yield to pedestrians in marked crosswalks and approach at a controlled speed.

A sign warning of bicyclists, a bike lane, or a shared path, often using a bicycle symbol. Drivers should give cyclists space and check for them before turning across a bike lane.

A yellow circular advance warning sign with an X and RR letters, placed before a railroad crossing. A white crossbuck at the crossing itself marks the exact location and means yield to trains.

A white X-shaped sign with the words RAILROAD CROSSING at a grade crossing, functioning like a yield sign. Drivers must look and listen for trains and may proceed only when the tracks are clear.

Flashing red lights, bells, or gates at a railroad crossing that activate when a train approaches. Drivers must stop when the lights flash or gates lower and must never drive around a lowered gate.

A large white X with the letters RR painted on the pavement before a railroad crossing. It reinforces the advance warning sign and warns drivers to slow down and prepare to stop if needed.

Painted lines, arrows, symbols, and words on the road surface that guide, warn, or regulate traffic. They work with signs and signals and may carry the same legal weight as a posted sign.

A solid white line across a lane marking where vehicles must stop at a stop sign or signal. Stopping before the line keeps the crosswalk and intersection clear for pedestrians and cross traffic.

A marked path for pedestrians across a roadway, shown by parallel lines or a ladder pattern. Drivers must yield to pedestrians in a crosswalk whether or not it is marked at an intersection.

Painted arrows in a lane showing the direction or movement allowed from that lane, such as left turn only. Drivers should be in the correct lane before the arrow's restriction begins at the intersection.

A sign or device mounted on or near a fixed object such as a bridge pier or island to make it visible to drivers. Object markers warn of a hazard close to the travel lane and should not be confused with guide signs.

An overhead signal, often a green arrow or red X, that shows whether a lane is open or closed to traffic at that time. Drivers must obey the signal rather than assuming a lane is always available.