Louisiana Weigh Station Operations and Bypass Regulations

Commercial vehicle enforcement in Louisiana is managed by the Department of Transportation and Development (DOTD) and the Louisiana State Police (LSP) Troop G. The state operates 12 primary weigh station locations, many of which are situated at critical entry points on Interstate 10, Interstate 20, and Interstate 55. These facilities ensure that vehicles meet the legal weight limit of 80,000 pounds on five axles without special permits. Drivers must be aware that Louisiana strictly enforces these limits to protect its coastal infrastructure and bridge systems, which are prone to deterioration from heavy loads and soft soil conditions. DispatchTool helps carriers navigate these requirements by providing truck-safe routing that accounts for restricted routes and known enforcement zones. The platform allows dispatchers to monitor driver progress through high-traffic corridors like the Baton Rouge I-10 bridge or the Atchafalaya Basin, ensuring that permits are attached to the digital load file before the driver reaches a scale. To organize your fleet's compliance documents and route history, you can create a DispatchTool account to start managing your daily operations more efficiently.

Primary Scale Locations and Operations

Louisiana maintains fixed scale houses at strategic locations including Baptist (I-10 Eastbound), Slidell (I-10 Westbound), and Greenwood (I-20 Eastbound). The Starks station on LA-12 and the Vinton station on I-10 near the Texas border are among the busiest in the state. Most fixed facilities operate 24 hours a day, 7 days a week, though smaller sites on state highways may operate during daylight hours only. The Louisiana DOTD also utilizes mobile enforcement teams equipped with portable scales to monitor secondary routes like US-90 and US-190 where drivers might attempt to bypass fixed sites. According to the DOTD, these facilities are critical for maintaining the state's 12,000 bridges, many of which have specific load ratings below the standard 80,000-pound federal limit.

Legal Weight and Size Limits

Under Louisiana Revised Statute 32:380-388, the maximum gross vehicle weight (GVW) is 80,000 pounds for a standard five-axle tractor-trailer configuration. Single axles are limited to 20,000 pounds, while tandem axles are restricted to 34,000 pounds. For vehicles traveling on non-interstate highways, these limits may be further restricted by local bridge postings. Width is capped at 8 feet 6 inches, and height is limited to 13 feet 6 inches. Any load exceeding these dimensions requires an oversize/overweight (OS/OW) permit issued by the DOTD Truck Permit Office. Fees for these permits vary based on weight, starting at a base rate of $10 for over-length and scaling up significantly for superloads exceeding 132,000 pounds.

Electronic Bypass Programs: PrePass and Drivewyze

Louisiana fully supports electronic screening through systems like PrePass and Drivewyze at most of its major interstate scale locations. These systems use Weigh-in-Motion (WIM) technology and transponders or mobile apps to evaluate a carrier's safety rating and weight while the vehicle is moving at highway speeds. If the carrier has a high safety score (ISS) and the WIM sensor confirms the vehicle is within legal weight tolerances, the driver receives a green light to bypass the station. Data from PrePass indicates that bypassing a single station saves an average of 5 minutes of time and approximately 0.4 gallons of fuel, which is significant for carriers frequently traversing the I-10 corridor.

Enforcement and Fines for Weight Violations

Fines for overweight violations in Louisiana are calculated on a sliding scale per pound of excess weight. According to Louisiana R.S. 32:388, violations up to 3,000 pounds over the limit may result in a fine of $0.02 per pound. For gross weights exceeding the limit by more than 10,000 pounds, the fine increases to $0.10 per pound of excess. Additionally, a vehicle found to be overweight can be offloaded on-site or held until a permit is secured or the load is shifted. Failure to stop at an open weigh station is a separate violation that can lead to a fine of up to $500 and a mandatory court appearance, depending on the jurisdiction and the officer's discretion.

LRP and IRP Checkpoints

Beyond weight enforcement, Louisiana scales often serve as checkpoints for International Registration Plan (IRP) and International Fuel Tax Agreement (IFTA) compliance. Officers verify that the carrier has a valid cab card and that the U.S. DOT number is clearly displayed on both sides of the power unit in a contrasting color, visible from 50 feet. Louisiana recently updated its enforcement technology to include Automated License Plate Readers (ALPR) at several stations to quickly identify carriers with expired registrations or active out-of-service orders. Ensuring that all credentials are up to date is essential to avoid delays that can exceed 60 minutes during a Level I North American Standard Inspection.

Agriculture and Special Commodities

Louisiana provides certain exemptions and specific permits for the transport of agricultural products, such as sugarcane and timber, which are vital to the state's economy. The 'Harvest Season' permit allows for a 10% increase in weight limits for certain commodities, bringing the allowable GVW to 88,000 pounds on non-interstate routes. However, these vehicles are still required to enter all open weigh stations to verify their permit status and axle weights. The DOTD emphasizes that these permits do not authorize travel over bridges that are posted with lower weight limits, and drivers must exercise extreme caution in rural parishes where road beds may not support the higher tonnage.

Sources

Louisiana Department of Transportation and Development (DOTD) (2024) — http://www.dotd.la.gov/ Louisiana State Legislature - Revised Statute 32:388 (2023) — https://legis.la.gov/Legis/Law.aspx?d=88241 Federal Motor Carrier Safety Administration (FMCSA) (2024) — https://www.fmcsa.dot.gov/

Frequently asked

Do I have to stop at a weigh station if I am empty?

Yes, in Louisiana, all commercial vehicles with a GVWR of 10,001 pounds or more must pull into open weigh stations regardless of whether they are loaded or empty.

What is the fine for bypassing a weigh station in Louisiana?

Bypassing an open scale is a misdemeanor violation of R.S. 32:388, which can result in fines ranging from $100 to $500 plus court costs and potential jail time for repeat offenders.

How do I get an overweight permit in Louisiana?

Permits can be obtained through the Louisiana DOTD ITAP (Intelligent Transportation Assistance Program) portal. Single trip permits typically cost between $10 and $100 depending on the excess weight.

Are scales open on holidays in Louisiana?

Major interstate scales like those on I-10 and I-20 are generally open 24/7, including holidays, to monitor heavy commercial traffic flow across state lines.

What is the maximum height allowed without a permit?

The maximum height allowed on Louisiana highways is 13 feet 6 inches. Anything taller requires a specific route survey and a permit from the DOTD.