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Most-missed Louisiana DMV rules
These are the numbers and rules that trip up new drivers most often on the real Louisiana knowledge test. Every fact below comes from our free Louisiana DMV practice test question bank, which has 180 questions across 8 topics.
Speed limits
- The guide does not print specific mph figures; it directs drivers to obey the posted maximum, which is set locally per Louisiana statute.
- The handbook states drivers must not travel below the posted minimum in a way that impedes the normal and reasonable flow of traffic.
- Reduced speed limits are required near school crossings and similar areas when children may be present, per the handbook's general speed rules.
- Louisiana law sets the default maximum speed on interstates and controlled access highways at 70 mph unless a different limit is posted.
- Louisiana sets the statutory maximum speed at 65 mph on multi-lane divided highways with partial or no control of access.
- The default statutory maximum speed on all other unposted Louisiana highways is 55 mph.
- RS 32:64 explicitly bans rolling roadblocks on all interstate highways in Louisiana.
Right of way
- The handbook states trains have the right-of-way one hundred percent of the time over cars, pedestrians, and even emergency vehicles.
- Vehicles entering a roadway from a driveway or alley must yield to traffic already on the main road, per Louisiana's right-of-way rules.
- Entering traffic must yield to vehicles already moving in the circulating lane of a roundabout.
- Louisiana law requires all vehicles to yield the right-of-way to a funeral procession, which must also drive with headlights and hazards on.
- The handbook lists yielding to persons using a guide dog or a white cane as a specific right-of-way obligation for drivers.
- A malfunctioning signal is treated like an all-way stop intersection, where the standard yield-to-the-right rule applies for simultaneous arrivals.
- When two vehicles arrive at an intersection at the same time, the driver on the left must yield to the driver on the right.
- Drivers must yield to pedestrians in marked or unmarked crosswalks.
- 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
- Louisiana sets the legal DUI threshold for drivers 21 and older at 0.08% BAC, above which chemical test failure or refusal leads to license revocation.
- Louisiana enforces a near-zero-tolerance rule for underage drivers, setting the threshold at just 0.02% BAC compared to 0.08% for adults.
- Refusing or failing a chemical test under the underage near-zero-tolerance standard can lead to license revocation, just as with adult DUI enforcement.
- Louisiana OMV suspends driving privileges for 180 days from the date of suspension for a first DWI offense with BAC 0.08% to 0.14%.
- A first DWI offense with BAC of 0.15% or higher results in a 2-year suspension from the date of suspension.
- A second DWI offense within 5 years at BAC 0.08% to 0.14% increases the suspension to 365 days.
- A second DWI offense at BAC 0.15% or higher results in a 4-year license suspension.
- Louisiana's zero-tolerance standard for under-21 drivers triggers a 180-day suspension at a BAC of just 0.02% or higher, far below the adult 0.08% threshold.
- Drivers whose license is seized after a 0.08%+ chemical test result get a temporary receipt valid to drive for up to 30 days from the date of arrest.
- Louisiana requires payment of a $50 reinstatement fee to the Office of Motor Vehicles after a DWI suspension period ends.
- Drivers with BAC 0.15%+ can only get a hardship/restricted license after proving an ignition interlock device has been installed, and must keep it installed through the full suspension.
Signals and markings
- A driver turning left must yield the right-of-way to all oncoming traffic, including bicyclists, before completing the turn.
- At uncontrolled intersections, drivers must yield to vehicles that are already in the intersection.
- A flashing yellow signal warns drivers to slow down and proceed carefully, rather than requiring a full stop.
- 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 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 flashing red signal is legally equivalent to a stop sign: the driver must come to a full stop before proceeding when clear.
- A solid yellow line facing your direction of travel indicates passing is not allowed from your side of the roadway.
- A steady yellow light warns the signal is about to turn red; drivers should stop safely if possible or proceed with caution if too close to stop.
- A flashing red signal functions like a stop sign, requiring drivers to come to a complete stop before proceeding when it is safe.
- A bike box lets cyclists position ahead of traffic; drivers must stop behind the box rather than within it.
- 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 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.
- 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.
- 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 steady yellow light warns that the right of way is ending and the signal is about to turn red.
- The truck apron is a raised, paved area only meant for large truck wheels; ordinary vehicles should never drive on it.
- A dashed yellow center line indicates passing is generally permitted when it can be done safely, unlike a solid yellow line.
- 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 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.
Safe driving
- Louisiana law prohibits opaque, non-transparent material on front windows unless a physician has prescribed it for a medical reason.
- The handbook notes reduced speed limits are appropriate in residential and business areas due to increased activity, without listing a fixed number.
- Intermediate licensees are statutorily required to ensure every occupant of the vehicle is properly restrained by a seat belt before operating the vehicle.
- A minimum three-second following gap gives most drivers enough time to react and stop safely under normal conditions.
- Sudden braking or sharp steering after a blowout can cause loss of control; easing off the gas while steering straight is safer.
- Advisory speed plates on curve warning signs indicate a safe reduced speed that drivers should slow to before entering the curve.
- Rural highways through unfenced farm and ranch land require extra alertness for livestock and wildlife crossing the road.
- A 3 to 4 second following distance gives drivers enough time to react and brake safely under normal conditions.
- On undivided roads, traffic in both directions must stop for a school bus with flashing red lights and an extended stop sign until it resumes moving.
- General right-of-way practice, reflected in the manual, is that the first vehicle to arrive and stop proceeds first; simultaneous arrivals yield to the right.
- Drivers in both directions on an undivided road must stop for a school bus with flashing red lights until it is safe to proceed.
- A minimum 3-second following distance gives drivers enough time to react to sudden braking by the vehicle ahead.
- An owner cited by a stop-arm camera faces monetary penalties instead of points: $250 for a first violation, rising to $300 for a third within 18 months.
- The manual teaches drivers not to swerve for animals, since swerving often causes worse crashes than a controlled collision or straight-line braking.
- Hydroplaning occurs when water accumulates faster than tire treads can disperse it, causing loss of contact with the road.
- Wet roads increase stopping distance, so drivers should slow down and add extra space to compensate for reduced traction.
- The manual requires yielding to pedestrians, cyclists, and others still clearing the intersection even if you'd otherwise have priority.
- 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.
- Because posted speed limits assume ideal conditions, the handbook advises reducing speed in rain and other hazardous conditions.
- 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 safe following distance gives a driver time to react and stop without a collision if traffic ahead slows or stops.
- The core safety reasoning is that other drivers may not yield as expected, so defensive caution prevents collisions.
- 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
- At a yield sign, drivers must slow or stop as needed to let crossing or oncoming traffic clear before proceeding safely.
- 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.
- Diamond-shaped yellow signs are standard warning signs alerting drivers to hazards ahead, such as curves, merges, or intersections.
- The circular yellow sign shape is specifically reserved in the national sign system for advance railroad crossing warnings.
- The eight-sided octagon shape is reserved exclusively for Stop signs so it can be recognized even from behind or in poor visibility.
- Yellow diamond signs are standard warning signs alerting drivers to hazards or changing road conditions ahead.
- The railroad advance warning sign is round with an X and R R symbol, one of the only circular warning signs used on US roads.
- Diamond-shaped yellow signs are the standard shape/color combination used for general warning signs about upcoming hazards or conditions.
- A downward-pointing triangle is the standard yield sign, instructing drivers to slow and give right of way to conflicting traffic.
- The manual specifically calls out School Crossing signs with children present as requiring reduced speed.
- Diamond-shaped yellow signs are warning signs, alerting drivers to hazards like curves, merges, or crossings ahead.
- Diamond-shaped yellow signs are warning signs, alerting drivers to hazards or changes in road conditions ahead.
- The handbook's statutory speeds apply only when no other limit is posted, meaning posted signage takes precedence.
- A stop sign always requires a complete stop and yielding to cross traffic and pedestrians before proceeding, consistent with the manual's yield principle.
- Drivers must stop at the marked line or crosswalk, or at the edge of the intersection if there is no marking, before proceeding.
- An inverted triangle is the standard shape used for yield signs, instructing drivers to slow and give way to other traffic.
- Warning signs (typically yellow, diamond shaped) inform drivers of hazards ahead like curves or crossings, distinct from regulatory signs that state legal requirements.
- Orange is the standard color used for temporary construction and work zone signs, regardless of the specific shape used.
- 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
- Louisiana law bars passengers of any age from riding in an open truck bed while the vehicle is on an interstate highway.
- The handbook specifically states riding inside a house trailer or travel trailer while it is being towed is illegal in Louisiana.
- DWI convictions, including equivalent out-of-state offenses, stay on a Louisiana driving record for 10 years.
- The Louisiana driver's guide states applicants must correctly answer 80 percent of the knowledge test questions to pass.
- The official guide specifies only the 80 percent passing threshold; the exact number of questions is determined by the testing system, not printed in the manual.
- The Class D and E Driver's Guide is published by the Louisiana Office of Motor Vehicles under the Department of Public Safety.
- An added $5 fine applies on top of standard penalties and is routed to the Louisiana Emergency Response Network Fund after covering the Bond Security and Redemption Fund.
- The curfew exception allows driving with a licensed parent/guardian, a licensed adult 21 or older, or a licensed sibling 18 or older.
- An intermediate licensee may not carry more than one passenger under age 21 who is not immediate family during these hours, unless accompanied by a qualifying licensed adult, with an exception for driver's education instructors with multiple student passengers.
- A person may begin classroom driver education no sooner than 90 days before their 15th birthday, provided they are at least in the 8th grade.
- No person under age 15 may enroll in or participate in the behind-the-wheel portion of any driver education course in Louisiana.
- Under-18 applicants need 8 hours of behind-the-wheel driving plus 30 hours of classroom instruction, while applicants 18 and older need 8 hours driving plus only 6 hours of classroom instruction.
- Anyone seeking a Class E temporary instructional permit must first be eligible for classroom instruction under RS 32:402.1 before taking the knowledge or road skills test.
Emergencies
- Drivers may not park their vehicle within the block where an emergency vehicle has stopped to respond to an incident.
- Drivers must yield to emergency vehicles by moving to the right edge of the roadway, staying clear of intersections, until it passes.
- Louisiana law requires stopping between 15 and 50 feet from the nearest rail when a railroad signal or gate warrants a stop.
- Louisiana law makes it illegal to stop a vehicle on railroad tracks under any circumstance.
- Louisiana law sets the stopping zone at between 15 and 50 feet from the nearest rail when a crossing signal requires a stop.
- If changing lanes away from the emergency vehicle isn't safe, the driver must slow to a reasonably safe speed; on two-lane roads, drivers must maintain a safe speed for conditions.
- Violating the move-over law is punishable by a fine not to exceed $200 upon conviction.
- The handbook states drivers must always yield right-of-way to emergency vehicles.
- 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.
- When changing lanes is not safe, the Move Over Law still expects drivers to reduce speed and use caution passing the stopped vehicle.
- The manual specifies the stop requirement does not apply when a physical median or other barrier separates the two roadways, unlike a simple painted line.
- Moving vehicles safely out of the flow of traffic prevents further collisions before drivers exchange license and insurance information.
- 23 V.S.A. § 1050(b) requires moving over a full lane if safe, or slowing to a reasonable speed if the driver must remain in the adjacent lane.
- Drivers must yield to emergency vehicles by moving to the right shoulder; on a divided highway of 4+ lanes, they should move over a lane away if it is safe to do so.
- Standard practice is to safely move to the right and stop, clearing the path for the emergency vehicle to 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.
- Authorized emergency vehicles may exceed posted limits during emergency duty with signals operating, as long as they do not endanger others.
- On divided highways of 4+ lanes, drivers should move over a lane away from a stopped emergency vehicle when it can be done safely.
- Move Over laws require drivers to move over or slow down for any stopped vehicle with warning lights activated, to protect people near the roadway.
- The manual instructs drivers to pull to the right edge and remain stopped until the emergency vehicle passes.
- Drivers must yield to emergency vehicles by pulling over and stopping, clearing the intersection first if already inside it.
- Drivers must yield to emergency vehicles by pulling to the right and stopping, while making sure not to block the intersection.
- 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.
- The manual requires drivers to stop for a school bus with flashing red lights from either direction, unless a physical median or barrier separates the roadways.
- The Move Over Law's amber-light tier covers highway maintenance vehicles, requiring drivers to move over or slow down similarly to emergency vehicles.
- When a safe lane change isn't possible, drivers are generally expected to reduce speed and use caution passing the stopped vehicle.
- Rapid brake lights or hazard signals ahead indicate a potential emergency or obstruction, so drivers should slow down and prepare to react safely.
- 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 Louisiana DMV practice test, which explains the reasoning behind every answer, or see Louisiana DMV facts and fees before test day.