Louisiana Driving Laws 2026: Speed Limits, DWI BAC and Louisiana OMV Road Rules for the Permit Test

What is the speed limit in Louisiana when driving on a highway with no posted limit? Louisiana law generally sets 55 mph on highways, 65 mph on multi-lane divided highways with partial or no access control, and 70 mph on interstate or controlled-access highways, unless a different limit is posted. Louisiana calls drunk driving DWI. DWI threshold: 0.08% for adults, 0.02% for under-21. Headlights are required from sunset to sunrise, when visibility is under 500 feet, when precipitation requires continuous windshield-wiper use, and in tunnels. Louisiana prohibits drivers from holding or manually operating wireless telecommunications devices while driving, with hands-free and other statutory exceptions.

1. Speed Limits in Louisiana

Louisiana law sets statutory maximums by highway type, while DOTD may establish a different posted speed zone after an engineering and traffic investigation. The General Speed Law requires driving at a safe, appropriate speed for actual conditions. Heres how Louisianas speed structure breaks down:

Key test point: Louisiana does not have a universal 70 mph ceiling. DOTD can establish a higher posted speed zone after an engineering and traffic investigation; for example, some rural portions of I-49 have been posted at 75 mph. The General Speed Law still requires a lower safe speed when road, traffic, visibility, or weather conditions require it.

2. Right-of-Way: Who Goes First

Louisiana right-of-way law requires drivers to yield in specific situations, including to pedestrians crossing within a crosswalk when traffic-control signals are not in place or not operating, to oncoming traffic when turning left, and to vehicles already in an uncontrolled intersection when required by law.

4-way stop (all arrive at once)

Driver to the right

4-way stop (one arrives first)

Driver who arrived first

Roundabout / traffic circle

Vehicles already inside the circle

Emergency vehicles (lights/siren)

Emergency vehicle, pull to the right and stop

Pedestrians in crosswalk

Pedestrians crossing within a crosswalk when traffic-control signals are not in place or not operating

T-intersection (no signs)

Through road traffic; drivers on the dead-end must yield

Yield sign

Cross traffic and pedestrians always

Merging onto a highway

Traffic already on the highway

3. Turns & Signal Laws

Louisiana requires a continuous turn signal for at least 100 feet before any turn. Drivers must move into the proper lane at least 100 feet before making a turn. Right turns on red are generally permitted after a full stop unless prohibited by a sign:

Right turn on red

Permitted after a full stop unless a sign prohibits it. Yield to pedestrians and cross traffic.

No right turn on red

When posted, you must wait for a green light before turning right.

Left turn on red

Only allowed from a one-way street onto another one-way street, after a full stop.

Left turn from two-way street

Approach from the portion of the right half of the roadway nearest the centerline; complete the turn so the vehicle leaves the intersection to the right of the centerline of the roadway being entered.

Right turn

Stay as close to the right curb as possible; end in the right lane.

U-turns

Legal where not prohibited and safe. Louisiana law prohibits turning to proceed in the opposite direction on a curve or near the crest of a grade where the vehicle cannot be seen by an approaching driver from either direction within 500 feet.

4. Lane Rules & Line Markings

Louisianas divided highways, including elevated I-10 segments over swampland, have specific rules about crossing medians and center lines. Louisiana law explicitly prohibits crossing a painted continuous centerline of any multi-lane highway except to make a left turn. Heres the full breakdown:

Center turn lane (CTSL)

Used for a left turn or U-turn, to merge into adjacent lanes after making a left turn onto the highway, or to reach a dedicated left-turn lane; do not drive in the two-way left-turn lane for more than 200 feet.

Solid white line

A single solid white line indicates lane changes are hazardous and should be made only with great care. Double solid white lines may not be crossed.

Solid yellow line (your side)

No passing allowed.

Broken yellow line

Passing allowed when safe.

Solid + Broken yellow centerline

Passing allowed only on the broken-line side.

Louisiana left-lane law: On multilane highways, use the left lane when directed, preparing for a left turn, overtaking or passing, or when right-hand lanes are congested. Do not impede traffic behind you, and vehicles moving slower than the posted maximum generally must keep right.

5. Passing Another Vehicle

Louisiana has a specific rule for motor trucks on rural highways: they must not follow within 400 feet of one another outside residential and business areas except to pass. On two-lane roads through the Atchafalaya Basin and rural parishes, passing distances are critical:

• Only pass on the left, using the oncoming lane, when it is safe and legal.
• Do not pass within 100 feet of an intersection, railroad crossing, bridge, or curve where your view is limited. Look for the No Passing Zone pennant sign.
• The vehicle being passed must not speed up while you are overtaking.
• Return to your lane before coming within 100 feet of oncoming traffic.
• Never pass a stopped school bus with flashing red lights, this applies in both directions on undivided roads.
• You may pass on the right when the vehicle ahead is turning left, on a one-way roadway wide enough for two or more lines of moving traffic, or on a multi-lane highway, but only when the movement can be made safely and without driving off the pavement or main traveled portion.
• Passing a bicycle: Louisiana requires at least 3 feet of clearance while overtaking and until safely past. A motorist may cross a no-passing zone to pass a bicycle only when it is safe.

6. Following Distance

Louisianas handbook adds a specific night-driving rule: increase your following distance by at least one additional second for night driving, and at least two additional seconds on unfamiliar roadways at night. Headlights limit what you can see, your following distance must reflect that.

7. School Buses & Emergency Vehicles

Louisiana treats failure to stop for a school bus so seriously that it is listed as a cause for license suspension, the same category as DWI and vehicular homicide. On Louisianas rural parish roads, school buses stop frequently at long driveways and isolated homes.

School Buses

• When a school bus stops with flashing red lights and an extended stop arm, drivers meeting or overtaking it must stop at least 30 feet from the bus unless the separate-roadway exception applies.
• On roads with a true median or physical barrier, only traffic behind the bus must stop, oncoming traffic may proceed.
• Two-way left-turn lane: One lane in each direction plus a dedicated two-way left-turn lane is not a divided highway, so both directions must stop. A highway with two or more lanes in each direction plus a designated two-way left-turn lane is treated as separate roadways, so opposing traffic on the other roadway is not required to stop.
• You must remain stopped until the red lights stop flashing and the stop arm is retracted.
• Failing to stop for a school bus loading or unloading children in Louisiana is a specific cause for license suspension under Louisiana law. You must stop and remain stopped until the red lights stop flashing and the stop arm retracts.
• Railroad crossings: School buses, whether carrying children or not, are among the vehicles required to stop at railroad grade crossings under Louisiana law, subject to the statutory exceptions.

Emergency Vehicles

• When you see or hear an emergency vehicle (police, fire, ambulance) with lights or siren: pull to the right edge of the road and stop. Do not block intersections.
• Move Over Law (Louisiana, effective Aug. 1, 2026): When approaching a vehicle parked on or near the highway that is using authorized visual warning signals, or a disabled, immobilized, or nonoperational vehicle displaying flashing lights, hazard lamps, or another emergency warning device, move into a lane not adjacent to it on an interstate or other road with two or more lanes in the same direction when it is safe. If a lane change is not possible or safe, or on a two-lane road, slow to a reasonably safe speed and maintain a safe speed for road conditions.

8. DWI Laws: Up to 30 Years 4th Offense

Louisiana law defines the offense as operating a vehicle while impaired. The adult BAC threshold is 0.08%, and drivers under 21 are subject to the separate 0.02% underage threshold. Criminal penalties increase for repeat convictions, and license suspensions can also arise separately from chemical-test results or refusals.

9. Seat Belts & Child Seats

"Buckle Up, Its Louisiana Law!", that is the official tagline in the states handbook. Louisiana requires all occupants in cars, vans, and pickups to be properly buckled. Effective August 1, 2026, a driver must wear the safety belt across both the lap and shoulder as designed, not behind the body or under the arm. Safety belts reduce serious injury risk and fatality risk each by 50 percent. The child restraint requirements are set by R.S. 32:295 and use age, size, and child-restraint manufacturer limits.

10. Where You Cannot Park

Louisianas parking rules include a specific fire station rule covering both sides of the street. Know the statewide distance restrictions:

• Within 15 feet of a fire hydrant
• Within 20 feet of a crosswalk at an intersection
• Within 20 feet on the approach to a flashing beacon, stop sign, or traffic control signal located at the side of the roadway
• Within 50 feet of a railroad crossing
• Within 20 feet of a fire station driveway entrance, or on the opposite side of the street within 75 feet of the entrance when properly posted
• On a sidewalk, in front of a driveway, or on a bridge
• In a no-parking zone or alongside a curb painted yellow or red
• Double parking (alongside a vehicle already parked at the curb)
• Headed downhill: turn wheels toward the curb. Headed uphill with a curb: turn wheels away from curb. Uphill without a curb: turn wheels toward the shoulder.

11. Driving in Bad Weather

Louisiana law requires headlights during specified low-visibility and precipitation conditions, and the Louisiana Driver’s Guide addresses wet pavement, hydroplaning, skids, and other adverse-weather conditions:

• Headlights required in Louisiana when moisture or precipitation necessitates the continuous use of windshield wipers, when persons or vehicles are not clearly discernible at 500 feet because of insufficient light or unfavorable atmospheric conditions, from sunset to sunrise, and while driving in a tunnel.
• In heavy fog, use low beams, high beams reflect off fog and reduce visibility.
• If you start to hydroplane, ease off the gas gently. Do not brake hard or turn sharply.
• In icy conditions, brake gently well in advance. Start slowing earlier than normal. Leave extra following distance.
• If your car goes into a skid, steer in the direction you want the front of the car to go. Do not overcorrect.
• Never use cruise control on wet, icy, or slippery roads.

12. Points & License Suspensions

Louisianas license suspension system is offense-based rather than a simple numeric point counter; specific convictions and violations trigger defined suspension periods.

• Passing a stopped school bus in violation of R.S. 32:80 can result in a 30-day suspension for a first conviction, 60 days for a second, and 1 year for a third.
• Other suspensions depend on the specific offense and driving record; Louisiana does not use the generic 3-, 4-, 5-, or 8-point table shown by some other states.

13. Headlight Rules

Louisiana law specifies exact headlight distances, 500 feet before meeting oncoming traffic, 200 feet when following another vehicle. The handbook also gives you the practical stopping-speed equivalents: low beams (150-200 ft) = safe at 45 mph; high beams (350-400 ft) = safe at 65 mph. These distances are stated in Louisiana law and the Louisiana Driver’s Guide.

Key point: Louisianas distances are 500 feet for oncoming traffic and 200 feet when following. The Louisiana Driver’s Guide also explains that low beams illuminate about 150-200 feet and high beams about 350-400 feet, so drivers should reduce speed to stay within the distance they can see and stop.

14. Night Driving

The Louisiana Driver’s Guide warns that drivers must be able to stop within the distance illuminated by their headlights. It explains that low beams provide about 150-200 feet of clear visibility and high beams about 350-400 feet, making speed reduction critical at night.

15. Cell Phones & Distracted Driving

Louisianas current wireless-device law applies to all drivers. A driver may not hold, physically support, or manually operate a wireless telecommunications device while operating a motor vehicle on a public road or highway unless the vehicle is lawfully stationary or a statutory exception applies. Hands-free calling and hands-free navigation are allowed. Heres what Louisiana law requires:

Key test point: Since January 1, 2026, Louisiana has moved beyond a texting-only rule: holding or manually operating a wireless telecommunications device while driving is prohibited for all drivers, subject to the statutes hands-free, lawfully stationary, emergency, and other listed exceptions.

16. Railroad: No Gear Changes on Tracks

Louisiana law requires a stop within 15-50 feet of the nearest rail when the statutory stopping conditions apply. Buses transporting passengers and covered commercial vehicles have additional stop-and-cross requirements, including selecting a gear that permits the crossing without shifting.

Key point: Never drive around or under a lowered crossing gate. Wait until the gate is raised and the tracks are clear before proceeding.

17. How to Drive a Roundabout

Louisiana driving rules require vehicles to travel to the right around a rotary traffic island, and entering drivers must yield to traffic already circulating in a modern roundabout. Follow posted signs and pavement markings for lane use and exits.

Key test point: Entering traffic must yield to traffic already inside.