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 sets 25 mph in residential areas, 55 mph on state highways, and 70 mph on rural interstates. Louisiana calls drunk driving DWI. DWI threshold: 0.08% for adults, 0.02% for under-21. Headlights are required 30 minutes after sunset and during rain, fog, or reduced visibility. All drivers are prohibited from texting while driving, primary offense.

1. Speed Limits in Louisiana

Louisiana sets a statewide maximum speed of 70 mph, the fastest any vehicle may legally travel on any Louisiana road. The General Speed Law requires driving at a safe, appropriate speed for actual conditions. Heres how Louisianas speed structure breaks down:

Key test point: Louisianas handbook makes it stark: at 75 mph, you have little chance of surviving a crash. The statewide maximum is 70 mph, driving 75 mph is explicitly breaking Louisiana law regardless of what any road feels like. The General Speed Law also means driving 55 mph in a snowstorm is not acceptable even if the posted limit allows it.

2. Right-of-Way: Who Goes First

Louisianas OMV knowledge test hits right-of-way scenarios hard, especially in New Orleans complex intersection grid and on rural two-lane bayou roads where right-of-way at private crossings is frequently tested. Right-of-way is always yielded; the law only tells you who must yield to whom.

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 always

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

Start from the left lane; end in the left lane of the cross street.

Right turn

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

U-turns

Legal where not prohibited by a sign; must not interfere with traffic. Illegal in Louisiana where a sign prohibits it, where you cannot safely complete the turn, where visibility is limited, or where it would interfere with traffic. Louisiana law treats improper U-turns as a moving violation.

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 only to begin or complete a left turn; not for through travel or merging. You may travel no more than 300 feet in the CTSL.

Solid white line

Do not cross; marks the edge of the road or a lane that should not be changed.

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.

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 200 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 only when the vehicle ahead is turning left and there is a usable lane to the right.

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, all traffic in both directions must stop on undivided roads.
• On roads with a true median or physical barrier, only traffic behind the bus must stop, oncoming traffic may proceed.
• A center turn lane does not count as a divider. On 4+ lane roads without a raised median or barrier, all directions must 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 must stop at ALL railroad crossings, with or without passengers, even if no lights are flashing and no train is visible. This is a frequently tested rule.

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): When approaching a stationary emergency vehicle, tow truck, or highway maintenance vehicle with lights flashing on a multi-lane road, move one lane away from the vehicle when it is safe to do so. If a lane change is not possible, slow down and proceed with caution.

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

Louisiana calls it DWI, Driving While Intoxicated, and the penalties escalate sharply with each conviction. A first DWI costs an estimated $4,500 when you factor in court costs, fines, and attorney fees. By the fourth conviction, you are facing up to 30 years in prison and a felony record that bars you from voting and many professions. The implied consent law means you have already consented to testing by getting your license.

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. Safety belts reduce serious injury risk and fatality risk each by 50 percent. The child restraint law uses a specific weight-and-age matrix that appears on the knowledge test.

10. Where You Cannot Park

Louisianas parking rules include a specific fire station rule covering both sides of the street, and distances that are tested directly on the OMV knowledge exam. Know every number before you test:

• Within 15 feet of a fire hydrant
• Within 20 feet of a crosswalk at an intersection
• Within 30 feet of a stop sign, yield sign, or traffic signal
• Within 50 feet of a railroad crossing
• 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

Louisianas weather is its own category, tropical downpours that dump inches in an hour, hurricane-force winds that make evacuation routes treacherous, dense fog over Lake Pontchartrain and the Atchafalaya Basin, and standing water on low-lying roads that can hide serious road damage underneath. The OMV handbook covers every scenario:

• Headlights required in Louisiana when moisture necessitates windshield wipers and when weather prevents other drivers from seeing your vehicle from 500 feet. Headlights (not just parking lights) must be on from sunset to sunrise.
• 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 point counter, specific violations trigger suspension directly. DWI convictions stay on your record for 10 years. And every conviction for driving while already suspended extends your suspension by another full year.

Note: Louisiana does not use a simple numeric point system for routine suspensions. Suspensions are triggered by specific offense categories. DWI convictions are maintained on your driving record for 10 years. Reinstatement requires paying reinstatement fees, and in DWI cases, filing SR-22 high-risk insurance for three years.

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 numbers appear directly on the OMV exam.

Key test point: Louisianas distances are 500 feet for oncoming and 200 feet when following, not 300 feet. This distinction from other states is tested directly on the Louisiana OMV exam. Also tested: low beams allow safe travel at about 45 mph; high beams allow about 65 mph, because your stopping distance must fit within your visible range.

14. Night Driving

Louisianas rural highways at night present serious hazards, deer, wild hogs, nutria, and even alligators cross roads in the bayou parishes after dark. The OMV handbook specifically warns against driving 75 mph at night as overdriving your headlights. Glare from oncoming vehicles on Louisianas flat, straight roads carries for great distances.

15. Cell Phones & Distracted Driving

Louisiana takes texting while driving seriously enough to make it a license suspension offense, not just a fine. Teen drivers and those on learners or intermediate licenses face a complete ban on all wireless device use while driving. Heres what Louisiana law requires:

Key test point: Louisianas texting law is unusually strict, a conviction results in license suspension, not just a fine. This is explicitly listed alongside DWI and vehicular homicide as a cause for suspension. Also tested: any driver within one year of their first-time Louisiana license issuance is subject to the same complete wireless device ban as teen drivers.

16. Railroad: No Gear Changes on Tracks

Louisiana has a unique railroad crossing rule tested on the OMV exam: you must not change gears until you have completely crossed over the tracks. The states freight rail network, including CN and BNSF lines, crosses public roads throughout north and central Louisiana. Know the exact stop distance range:

Key test point: Never drive around or under a lowered crossing gate, it is illegal and extremely dangerous. Wait until gates are fully raised and all tracks are clear.

17. How to Drive a Roundabout

Roundabouts are appearing at intersections across Louisianas highway network, including on state routes in the New Orleans metro, Baton Rouge suburbs, and along US corridor improvements. The OMV tests them directly. The rule that most drivers miss: entering traffic must yield to vehicles already circulating inside, every time, without exception.

Key test point: The most common wrong answer on roundabout questions is thinking you have right-of-way when entering. You never do, yield to traffic already inside.