A new traffic law in Louisiana could mean jail time for a common driving habit. As of August 1,2025, drivers in Louisiana state face hefty fines or even jail time for driving just under 1 mph under the speed limit in the left lane.
This new traffic law aims at improving the flow of traffic on the highways and reducing accidents, especially those associated with overtaking on the right side. Besides this law, more road safety reforms have been introduced to address issues such as uninsured motorists and distracted driving to make Louisiana highways safer for all users.
Why Driving 1 mph Under the Limit Could Land You in Jail
This new traffic rule aims at preventing drivers from misusing the left lane. Previously, one could only be penalized if they were driving 10 mph below the speed limit. If found guilty, one could be fined $150 for the first offense, and $250 for a second offense. If found guilty for the third time within 12 months, one could face a hefty fine of $350, or up to 30 days in jail.
As stated in Act 24: “A fine of $350 for a third subsequent offense within a twelve-month period of the first offense or imprisonment for not more than thirty days, or both.”
What Louisiana’s Left-Lane Law Actually Means
It is essential to understand that this new law doesn’t penalize drivers just for driving 1 mph under the speed limit, but for occupying the left lane while driving slower than drivers behind and for not actively overtaking another vehicle. Therefore, if you are driving slower than other drivers or if not overtaking, you are expected to strictly stay on the right lane.
This law was enacted because it was found that improper use of the left lane causes dangerous right-side overtaking, slows traffic, and causes sudden lane shifts, contributing to road rage. It is also referred to as a “keep right except to pass” rule, which also exists in other states. Louisiana’s version of this law is, however, among the strictest in the country.
Other Major 2025 Road Safety Laws in Louisiana
Besides this new law that prohibits driving 1 mph under the speed limit, Louisiana has also banned driving while using a handheld device for texting, calling, or scrolling maps. The law allows the use of a device if its completely hands-free.
Secondly, Louisiana has introduced stricter window tint limits. The legal limit for front side windows has been lowered from 40% to 25% light transmission. This change will mean that Louisiana’s standard will be at par with Texas and Arkansas.
The third law is about insurance. Uninsured drivers who get involved in accidents will be prevented from receiving up to $100,000 in damages even if they were at fault.
Lastly, drivers who get involved in hit-and-run offenses will have to face mandatory minimum jail sentences. This new law aims to ensure that victims get the justice they deserve while also discouraging drivers from fleeing accident scenes.
How to Stay Safe and in Adherence to Laws on Louisiana Roads
To avoid breaking the law and possible fines or punishments, on Louisiana roads, you should:
- Only use the left lane when overtaking and always return to the right lane after overtaking.
- Avoid holding devices on your hand whether for calls, texting, or even navigation.
- Check your front window tint and ensure that it complies with the new 25% rule.
- Ensure you always have a valid auto insurance to avoid penalties in case of an accident.
- Obey speed limits, especially while on the left lane.