Study this first
Most-missed Oklahoma DMV rules
These are the numbers and rules that trip up new drivers most often on the real Oklahoma knowledge test. Every fact below comes from our free Oklahoma DMV practice test question bank, which has 180 questions across 9 topics.
Speed limits
- Undivided state highways carry a default maximum of 65 mph under Oklahoma's speed limit schedule.
- Oklahoma sets a 35 mph default for roads within state parks and wildlife refuges.
- The Basic Speed Rule requires driving no faster than is safe for conditions, independent of the posted maximum.
- The manual recommends turning at 10 mph or less for safety.
- Many Oklahoma expressways and turnpikes post a minimum speed (often around 40 mph) precisely because unusually slow driving creates a hazard.
- Rural interstate segments may be posted up to 75 mph after a Transportation Commission engineering study.
- The Turnpike Authority may set speed limits up to 80 mph, subject to approval by the Commissioner of Public Safety and posted signage.
- Oklahoma school zones carry a statutory default speed limit of 25 mph during designated times, though ODOT can set it higher after an engineering study.
- Unposted county roads default to 55 mph unless the board of county commissioners posts a different limit.
Right of way
- The manual treats right-of-way as something to be yielded when necessary, not a privilege to be forcibly claimed.
- Oklahoma requires yielding to funeral processions accompanied by a lead vehicle escort.
- Oklahoma law requires drivers to always yield to pedestrians who are blind and using a white cane or guide dog.
- Drivers must stop for a bus displaying flashing lights and a stop-arm, with an exception typically applying only on certain divided highways.
- Oklahoma's manual notes that traffic on the opposite side of a divided highway is generally not required to stop for a bus stopped across the median.
- Vehicles already in a roundabout have priority over vehicles waiting to enter.
- Trains always have the right-of-way at grade crossings, since they cannot stop quickly or swerve.
- At uncontrolled intersections, when vehicles arrive simultaneously, the driver must yield to the vehicle approaching from the right.
- Do not cut through or break up a funeral procession. Slow down, be patient, and let it pass. Cutting between the vehicles is unsafe and often illegal.
- At an uncontrolled intersection, slow down and yield to any car already in the intersection or approaching from your right.
- A left-turning vehicle must yield to oncoming through traffic and to pedestrians. Only turn when the gap is safe.
- When entering a roundabout, yield to traffic already circulating and travel counterclockwise. Exit at your street; do not stop in the middle of the circle.
- At a T-intersection, traffic on the road that ends must yield to traffic on the through road that continues.
- A round green light allows a left turn but does not give you the right of way. Pull into the intersection, yield to oncoming through traffic and pedestrians, then turn when there is a safe gap.
Alcohol and DUI
- Oklahoma sets the per se DUI threshold for adult drivers at 0.08% BAC or higher.
- Oklahoma's Zero Tolerance Law prohibits any measurable quantity of alcohol for drivers under 21, not just 0.08% or a 0.02% cutoff used elsewhere.
- A first offense under the Zero Tolerance Law results in a 6 month license revocation.
- Oklahoma allows administrative license revocation tied to a BAC of 0.08% or more independent of a separate criminal conviction.
- A first DUI offense is a misdemeanor punishable by 10 days to 1 year in jail, a fine up to $1,000, and a mandatory substance abuse assessment.
- A second DUI within 10 years carries a mandatory minimum of 5 days imprisonment, up to a $2,500 fine, and mandatory ignition interlock device installation.
Signals and markings
- A solid yellow line on your side of the centerline marks a no passing zone for traffic in your direction.
- A flashing red signal requires a full stop, just like a standard stop sign, before proceeding when safe.
- Flashing yellow signals warn drivers to slow and proceed carefully, unlike the mandatory stop of a flashing red.
- The handbook notes posted limits are for ideal conditions, so hazards like hills and curves require a driver to slow below the sign's number.
- A dashed yellow centerline indicates passing is generally allowed on that side when it is safe to do so and no other restriction applies.
- The manual requires dimming high beams for oncoming traffic to avoid blinding other drivers.
- A solid yellow line on your side of the centerline means passing is not permitted there, usually due to reduced visibility or other roadway hazards.
- Double solid yellow lines indicate that passing is not permitted from either direction on that stretch of road.
- A flashing yellow signal warns drivers to proceed through the intersection with caution rather than requiring a full stop.
- A steady red signal requires a full stop; any right turn on red is only allowed after stopping and when safe and not prohibited by signage.
- A solid yellow line on your side of the center marking indicates passing is prohibited from that direction due to limited sight distance or other hazards.
- A solid yellow line facing your direction of travel indicates passing is not allowed from your side of the roadway.
- A solid yellow line on your side of the centerline indicates that passing is prohibited from that side of the road.
- On a plain green light, a left-turning driver must yield to oncoming traffic and pedestrians before completing the turn.
- A flashing yellow signal warns drivers to slow down and proceed carefully, unlike a solid red which requires a full stop.
- When a signal is dark or malfunctioning, drivers must treat the intersection as a four-way stop, coming to a full stop and yielding to the vehicle on the right if both arrive at the same time.
- A flashing red signal functions like a stop sign, requiring drivers to come to a complete stop before proceeding when safe.
- A dashed yellow center line indicates passing is generally permitted when it can be done safely, unlike a solid yellow line.
- A solid yellow line on your side of a centerline pair generally means passing is prohibited in that direction, while a broken line permits passing when safe.
- A solid yellow line on a driver's side of the centerline indicates that passing is prohibited from that side of the road.
- A red flashing light is treated like a stop sign: stop, then yield to vehicles already in or entering the intersection.
- A flashing yellow arrow permits the indicated turn but the driver must first yield to pedestrians and oncoming traffic.
- A law enforcement officer's directions override traffic signals, so drivers must obey the officer even if it means stopping on a green light.
- The truck apron is a raised, paved area only meant for large truck wheels; ordinary vehicles should never drive on it.
- A steady yellow signal warns that the light is about to turn red, so drivers should stop if they can do so safely.
- A flashing yellow signal warns drivers to slow down and proceed carefully through the intersection, unlike a dark signal which is treated as a stop.
- A yellow light signals that the light is about to change to red, and drivers should stop if they can do so safely rather than accelerate through it.
- A flashing yellow light means slow down, look, and proceed carefully. It does NOT require a full stop the way a red light or STOP sign does.
- A flashing hand or countdown means do NOT start crossing. If you are already in the crosswalk, keep going and finish crossing safely.
- A steady DON'T WALK hand prohibits starting to cross. Only a WALK signal or walking-person symbol allows you to begin crossing.
- Always signal continuously through a turn or lane change even when you see no other cars, because pedestrians or cyclists may be near. Cancel the signal after you finish.
- A green downward arrow means the lane is open for you to use. A red X above the lane means it is closed and you may not drive in it.
- Double solid yellow lines separate opposing directions and prohibit passing. You may only cross them for a permitted left turn or a legal U-turn into an intersection or driveway.
- A broken yellow line on your side of the lane allows passing when it is safe. The solid line on the opposite side means that direction may not pass.
- White lines separate lanes going the same direction. A solid white line means stay in your lane and avoid changing lanes, while a broken white line lets you change lanes when safe.
- A two-way center left-turn lane is only for preparing to turn left or merging into traffic. You may not use it to drive straight through or to pass.
Parking
- Restrictions on parking near hydrants exist to ensure firefighters have unobstructed access in an emergency.
Safe driving
- Drivers must yield to emergency vehicles with active lights and siren by safely moving aside, not stopping in the travel lane.
- The Basic Speed Rule obligates drivers to reduce speed below the posted maximum in hazardous conditions.
- Oklahoma's Move Over Law applies broadly to any stationary vehicle with flashing lights, not just law enforcement.
- Because SMV-marked vehicles like tractors move slowly and may turn into fields or driveways, safe practice is to keep distance and watch for signals before passing.
- Handbooks generally recommend a multi-second following distance that should be increased in bad weather, at higher speeds, or in heavy traffic.
- A 3 to 4 second following distance gives drivers enough time to react and brake safely under normal conditions.
- Rural highways through unfenced farm and ranch land require extra alertness for livestock and wildlife crossing the road.
- Because posted speed limits assume ideal conditions, the handbook advises reducing speed in rain and other hazardous conditions.
- A several-second following distance, often cited as at least 3 seconds under normal conditions, provides reaction time to avoid rear-end collisions.
- General safe-driving principles hold that adverse weather reduces traction and visibility, requiring lower speeds than posted limits allow in good conditions.
- Since entering roundabout traffic must yield to vehicles already circulating, slowing down and watching for a safe gap is the correct approach.
- A safe following distance gives a driver time to react and stop without a collision if traffic ahead slows or stops.
- The manual warns that leaving a large vehicle's wind-sheltered draft can expose your car to a sudden crosswind push, requiring a steering correction.
- The manual requires headlights to be on whenever visibility is under 1,000 feet.
- Scanning further ahead gives drivers earlier warning of hazards, slowing traffic, or obstacles, allowing more time to react safely.
- Work zones require reduced speed and heightened alertness because of workers, equipment, and changing lane patterns.
- The manual sets a specific cutoff allowing mopeds/scooters only on roads posted at 50 mph or lower.
- Drivers are generally taught to keep a multi-second time gap behind the vehicle ahead, increasing it in rain, snow, or fog for adequate stopping distance.
- Since farm tractors typically travel around 25 mph, the speed differential requires extra caution and clearance when passing.
- Wet roads increase stopping distance, so drivers should slow down and add extra space to compensate for reduced traction.
- The safe response to a skid is to ease off the gas and steer smoothly in the direction you want to travel, rather than braking hard or overcorrecting.
- Children under 7 must use a child restraint system meeting 49 CFR 571.213 standards unless they are 57 inches or taller.
- Drivers must stop for a school bus with flashing red lights and remain stopped until the lights stop flashing, protecting children crossing.
- A minimum three-second following distance under normal conditions gives a driver time to react and brake safely, with more time needed in poor weather.
- With a tailgater, open up more space in front of you so you can brake gradually instead of suddenly. Do not brake to retaliate and do not race away.
- Strong crosswinds can push your car out of its lane. Hold the wheel firmly with both hands, slow down, and be ready for sudden gusts.
- Do not engage. Avoid eye contact, do not brake in retaliation, let them pass, and leave a safe distance between you and that car.
- Horses and livestock spook easily. Slow down, do not honk or rev your engine, and pass very slowly with plenty of room so you do not startle them.
- When you see a hazard developing ahead, cover the brake and plan an escape route so you can react faster if you have to stop.
- In a skid, ease off the gas or brake and steer gently in the direction you want the front of the car to go. Slamming the brakes makes the skid worse.
Road signs
- Yellow diamond signs are the standard warning sign shape used nationwide, including Oklahoma, to alert drivers to hazards ahead.
- The octagon shape is reserved exclusively for the stop sign, requiring a full stop.
- White rectangular signs are the standard shape for regulatory signs like speed limits and turn restrictions.
- Orange is reserved nationally for temporary construction and maintenance zone signage.
- STOP (R1-1): full stop at the line or crosswalk even when empty; yield, then proceed.
- YIELD (R1-2): give up the right-of-way; slow and be ready to stop.
- DO NOT ENTER (R5-1): entry prohibited; common at freeway off-ramps and one-way streets.
- WRONG WAY (R5-1a): you have entered opposing traffic. Pull over safely and turn around when possible.
- ONE WAY (R6-1): all traffic flows in the arrow's direction.
- NO U-TURN (R3-4): no U-turns at this location. This is not a no-left-turn sign (a different arrow shape) or a no-passing sign (a different shape and color entirely).
- NO LEFT TURN (R3-2). A red circle-and-slash always bans the pictured movement.
- NO RIGHT TURN (R3-1): no right turns, including on red. Going straight is still fine since the sign only bans the right-turn movement; parking is unrelated to this sign.
- White/black = regulatory. Speed Limit is the legal max in ideal conditions; drive slower when conditions are bad (Basic Speed Law).
- KEEP RIGHT (R4-7): a median or obstruction is ahead; keep to its right.
- The crossbuck (R15-1) stands at the tracks and legally works like a YIELD sign: slow, look both ways, be ready to stop.
- Advance warning (W10-1): tracks ahead. Slow down, look, and listen.
- School (S1-1): school zone or crossing. Slow down and watch for children; obey the posted reduced school-zone speed limit, which varies by state.
- Pedestrian crossing (W11-2): crossing ahead; slow and be ready to stop.
- Signal ahead (W3-3): an intersection signal is coming, useful when it hides behind a curve.
- Stop ahead (W3-1): a stop sign is coming (often obscured); start slowing now.
- Merge (W4-1): traffic joins ahead. Adjust speed and position to let them in safely.
- Lane ends (W4-2): merge early; zipper-merge when traffic is heavy.
- Two-way traffic (W6-3): you are leaving a one-way road; keep right.
- Divided highway begins (W6-1): directions separate around a median; always keep right of it.
- Slippery when wet (W8-5): slickest in fresh rain. Slow down, keep distance, steer smoothly.
- Curve (W1-2): slow BEFORE the curve; do not brake in the middle of it.
- Turn (W1-1): sharper than a curve; slow down hard, follow the advisory plaque.
- Winding road (W1-5): consecutive curves; hold a steady lower speed throughout.
- Crossroad (W2-1): an intersection ahead with traffic entering from both sides. Hospital signs are blue with an H.
- NO PASSING ZONE (W14-3): unique pennant shape, posted on the LEFT side, marks where passing becomes illegal.
- An inverted triangle is the standard shape used for yield signs, instructing drivers to slow and give way to other traffic.
- The octagon shape combined with red coloring is reserved exclusively for stop signs, requiring a full stop.
- The downward-pointing triangle is the standard yield sign shape, meaning drivers must slow and give the right of way if needed rather than always stopping.
- Warning signs alert drivers to hazards or changing conditions ahead, while regulatory signs like stop/yield signs impose legally required actions.
- Drivers must stop at the marked line or crosswalk, or at the edge of the intersection if there is no marking, before proceeding.
- The eight-sided octagon shape is reserved exclusively for Stop signs so it can be recognized even from behind or in poor visibility.
- The circular yellow sign shape is specifically reserved in the national sign system for advance railroad crossing warnings.
- White rectangular signs with black lettering are the standard shape and color used for regulatory information like speed limits or turn rules.
- The five-sided pentagon shape is reserved specifically for school-related warning signs, distinct from all other warning sign shapes.
- A YIELD sign requires slowing down and stopping only if needed to give way to traffic or pedestrians on the intersecting road.
- A stop sign always requires a complete stop and yielding to cross traffic and pedestrians before proceeding, consistent with the manual's yield principle.
- The eight-sided red STOP sign requires a complete stop at the marked line or intersection before proceeding when safe.
- A yield sign requires slowing and yielding to conflicting traffic, stopping only if needed to avoid a hazard.
- The triangular shape is uniquely reserved for Yield signs, telling drivers to slow and give way rather than come to a full stop.
- Warning signs (typically yellow, diamond shaped) inform drivers of hazards ahead like curves or crossings, distinct from regulatory signs that state legal requirements.
- Diamond-shaped yellow signs are the standard shape/color combination used for general warning signs about upcoming hazards or conditions.
- The five-sided pentagon shape is used nationally to indicate school zones and school crossing warnings.
- The yellow pennant-shaped sign marks the start of a no-passing zone. It usually appears along with a solid yellow line on the pavement.
- A yellow diamond-shaped sign is a WARNING sign, alerting you to a hazard or change ahead such as a curve, intersection, or school, so you slow down.
- A white rectangular sign with black lettering is a REGULATORY sign stating a law you must obey, such as speed or direction of travel.
- An orange sign marks a construction or roadwork zone. Slow down and watch for workers and shifting lanes.
- A blue sign points to driver services such as gas stations, food, lodging, or hospitals.
- A green sign is a GUIDE sign, showing directions, distances, and the names of exits or places.
- A red circle with a slash means the action shown is PROHIBITED, such as no turn or no U-turn at that spot.
Laws and paperwork
- The manual describes a knowledge test, vision screening, and driving skills test as part of licensing.
- The manual states a failed written test requires waiting at least one day before attempting it again.
- The manual is issued by Service Oklahoma together with the Department of Public Safety.
- Cities and towns may establish their own ordinance-based speed limits for local streets and zones, so posted signage governs.
- Oklahoma's GDL program requires a Student Driver/Learner Permit applicant to be at least 15 years old.
- An Oklahoma Intermediate License requires the driver to be at least 16 years old.
- An Oklahoma Unrestricted License under the GDL track requires the driver to be at least 16.5 years old.
- Oklahoma created a Farm Driving Permit for ages 14-17 and added a mandatory free Oklahoma WorkZone Safe Course certificate requirement for an Intermediate License under age 18.
- Applicants may attempt the online written knowledge test only twice; after two failures online, they must appear in person for further attempts.
Emergencies
- Activating hazard lights and getting the vehicle safely off the roadway reduces the risk of being struck by passing traffic.
- Drivers must move over a lane or slow down when passing any stationary vehicle with flashing lights on the roadside, not just law enforcement vehicles.
- When no adjacent lane is available, Oklahoma law requires drivers to proceed with due caution and reduce speed to a safe speed for road, weather, and traffic conditions, rather than a fixed numeric reduction.
- Drivers must yield to emergency vehicles by pulling over to the right side of the road, clear of intersections, and stopping until the vehicle passes.
- A move-over violation causing death carries a fine of up to $10,000 and a 1-year license suspension, compared to 90 days for bodily injury and 6 months for serious bodily injury.
- If pulling fully off the road isn't immediately possible, drivers should slow down and use extra caution, but the priority is always to get completely off the pavement as soon as safely possible per Pull Aside, Stay Alive guidance.
- The Move Over Law's amber-light tier covers highway maintenance vehicles, requiring drivers to move over or slow down similarly to emergency vehicles.
- Drivers may not park their vehicle within the block where an emergency vehicle has stopped to respond to an incident.
- Pumping the brakes can rebuild some pressure, and downshifting uses engine braking to help slow the vehicle safely before using the parking brake carefully.
- Regardless of whether a crossing has gates or signals, drivers must never attempt to beat a visible train and must stop and wait for it to clear.
- Since moose eyes don't glow like deer eyes under headlights, drivers must scan for a large silhouette instead.
- On divided highways of 4+ lanes, drivers should move over a lane away from a stopped emergency vehicle when it can be done safely.
- Drivers must yield right-of-way to emergency vehicles operating with active lights and siren.
- The Move Over Law has escalating consequences: a basic violation carries a modest fine and point penalty, a violation causing a crash carries a higher fine, and one causing death or serious injury carries the harshest penalty.
- Drivers must yield to emergency vehicles by pulling over to the right and stopping until the vehicle has passed.
- Standard practice for emergency vehicle right-of-way is to safely move to the right side of the road and stop to let it pass.
- Hazardous materials carriers must stop at every railroad crossing regardless of visible train activity, so drivers behind them should expect and safely wait through this stop.
- The manual notes you only have right of way if the other vehicle isn't already in the intersection, meaning a vehicle already there should be allowed to clear first.
- On typical two-lane roads, traffic in both directions must stop for a loading school bus; the opposite-direction exception applies only on wider divided highways.
- If your car catches fire or smells like burning, pull over, shut off the engine, and get everyone away. Do not open the hot hood, since the rush of air will make the fire flare up.
- If the gas pedal sticks, shift to Neutral to cut the power, then brake and steer to the shoulder. Only turn off the engine after you have fully stopped, so you do not lose power steering.
Signs
Sign shape and color carry meaning before you even read the words. A red octagon always means stop, a red-bordered triangle pointing down means yield, and yellow diamonds warn of a hazard ahead. For every sign image used in our practice test, with the exact meaning and explanation, see the full road sign glossary.
Keep studying
This cheat sheet is a summary, not a substitute for practice. Test yourself with the free Oklahoma DMV practice test, which explains the reasoning behind every answer, or see Oklahoma DMV facts and fees before test day.