Missouri Permit Test key terms

A sign that states a traffic law or requirement, such as STOP, YIELD, speed limits, or turn restrictions. White background with black or red markings, usually rectangular. You must obey these signs; they are not suggestions.

A yellow diamond-shaped sign that alerts you to a change or hazard ahead, such as a curve, school zone, or railroad crossing. It tells you to slow down or prepare, not to stop.

A white rectangular sign with black numbers showing the maximum legal speed in good conditions. It is a limit, not a target; slower speeds are required in rain, snow, fog, or heavy traffic.

The requirement to drive at a speed that is reasonable and prudent for current conditions, even if that is below the posted limit. Weather, visibility, road surface, and traffic all count.

A solid red signal means stop completely before the crosswalk or stop line and remain stopped until the light turns green. You may turn right after stopping only if no sign forbids it and you yield to traffic and pedestrians.

A solid green signal means you may proceed straight or turn, but only after yielding to vehicles and pedestrians still in the intersection. A green light does not give you an absolute right to go.

A flashing red signal works like a stop sign: come to a complete stop, yield to cross traffic and pedestrians, then proceed when it is safe. Often used where a signal is malfunctioning or at low-volume intersections.

A flashing yellow signal means slow down and proceed with caution. It does not require a stop, but you must watch for cross traffic, pedestrians, and hazards before entering the intersection.

After a complete stop at a red light, you may turn right when the way is clear, unless a sign prohibits it. You must yield to pedestrians in the crosswalk and to traffic on the cross street.

The legal priority to move through a given space at a given time. It is something others give you, not something you take; drivers must yield when rules or safety require it.

A downward-pointing red and white triangle meaning you must slow or stop and let cross traffic and pedestrians go first. Unlike a stop sign, a full stop is required only when necessary to give way.

An intersection where all approaches have stop signs. The first vehicle to stop goes first; if two arrive at the same time, the one on the right has the right-of-way. Never assume; confirm with eye contact.

An intersection with no signs or signals. You must yield to traffic already in the intersection and to the vehicle on your right if you arrive at about the same time. Slow down and be ready to stop.

When turning left on a solid green, you must yield to oncoming traffic and to pedestrians in the crosswalk. Wait for a safe gap; do not assume oncoming drivers will slow for you.

A left turn made on a green arrow, which gives you the right-of-way over oncoming traffic. Still check for pedestrians and vehicles that may be clearing the intersection.

An overhead or roadside sign, often with arrows, that tells you which movements a lane allows, such as left turn only or straight only. Obey it even if you intended a different route.

A lane marked with two-way left-turn arrows in the middle of the road, used to begin or complete left turns. It is not a travel lane and not for passing or merging into through traffic.

A lane intended for overtaking slower traffic, typically the left lane on multi-lane highways. Use it to pass, then return right; lingering in it blocks traffic and is restricted in many situations.

A stretch of road marked by solid yellow lines or signs where overtaking is prohibited, usually because of limited sight distance. Passing here is dangerous and illegal even if the road looks clear.

A yellow line separating traffic moving in opposite directions. A solid line on your side means do not cross to pass; a double solid yellow means neither direction may cross.

A dashed white line separating lanes of traffic moving in the same direction. You may cross it to change lanes when it is safe and you have signaled.

Moving from one lane to another. Signal first, check mirrors and blind spots, and move only when there is a safe gap; other drivers are not required to make room for you.

The area beside and behind your vehicle that mirrors do not show. Check it by turning your head before changing lanes, and remember large trucks have much larger blind spots than cars.

The gap between your vehicle and the one ahead. Under normal conditions keep at least three seconds; increase it in rain, at night, behind trucks, or when being tailgated.

A method for judging following distance: watch the vehicle ahead pass a fixed object, then count three seconds before you reach it. If you arrive sooner, you are too close.

Following another vehicle too closely, leaving no room to stop if it brakes suddenly. If someone tailgates you, increase the gap ahead so you can slow gradually rather than brake hard.

A marked or unmarked path where people cross the road. Drivers must yield to pedestrians in a crosswalk, and passing a vehicle stopped at a crosswalk is dangerous and often illegal.

An area near a school where lower speed limits apply during posted hours or when children are present. Watch for crossing guards, flashing signals, and children who may step out unexpectedly.

The red stop sign extended from a school bus picking up or dropping off children. On undivided roads you must stop in both directions until the arm retracts and the red lights stop flashing.

A road with separate roadways for each direction, separated by a median or barrier. On a divided highway, traffic on the opposite side is not required to stop for a school bus on your side.

The large blind spots around a commercial truck: directly behind, along both sides, and in front. If you cannot see the truck driver's mirrors, the driver likely cannot see you.

Watching carefully for motorcycles, which are smaller and harder to see than cars and may be hidden in blind spots. Give them a full lane and allow extra following distance.

By driving on Missouri roads you agree to submit to a chemical test of breath, blood, or urine when lawfully arrested for an alcohol-related offense. Refusal can bring license sanctions separate from the criminal case.

The percentage of alcohol in your blood, used as the legal measure of impairment. Missouri's limit is 0.08 percent for drivers 21 and older, with lower limits for minors and commercial drivers.

Operating a motor vehicle while impaired by alcohol or drugs to the point that you cannot drive safely. It can be charged even below the numeric limit if evidence shows impairment.

Any activity that takes your eyes, hands, or attention away from driving, such as texting, eating, or adjusting a device. Missouri restricts texting for drivers and bars handheld use for those under 21.

Missouri adds points to your driving record for moving violations; accumulating enough points in a set period leads to suspension or revocation. Points also affect insurance costs.

A temporary loss of driving privileges for a set period, after which you may apply for reinstatement. It differs from revocation, which withdraws the license and requires a new application.

A learner's permit that lets a new driver practice under stated restrictions, such as driving with a licensed adult. Missouri issues graduated permits to teens before a full license.

A staged licensing system for new drivers, moving from instruction permit to intermediate license to full license as age and clean driving time accumulate. Each stage carries its own restrictions.

Missouri law requires drivers to carry liability insurance covering bodily injury and property damage, and to show proof when requested. Driving uninsured can cost your license and plates.