Legal Weight Limits

Louisiana generally enforces the federal weight standards of 80,000 lbs gross vehicle weight, 20,000 lbs per single axle, and 34,000 lbs per tandem axle on interstate highways. On state-maintained roads, higher axle and gross weight limits are permitted for certain vehicles if appropriate permits are obtained or specific exemptions apply. For example, trucks hauling sugarcane or forest products during harvest season may operate up to 86,600 lbs on non-interstate routes with a harvest season permit.

Without special permits, steering and other single axles are limited to 20,000 lbs, tandems to 34,000 lbs (up to 37,000 lbs for forest products in their natural state, except on the interstate) and Louisiana acknowledges the federal Bridge Formula for weight distribution.

In addition, off the interstate an axle variance of 2,000 lbs for single axles and 3,000 lbs for tandem and larger groups applies, and trucks hauling concrete, construction aggregates or solid waste are not penalized for axle overages, as long as gross weight remains within legal limits. Annual and single-trip overweight permits can allow much heavier loads, up to 120,000 lbs gross on an annual permit and as much as 254,000 lbs on a single-trip permit on designated routes.

For some permitted movements, single axles may be allowed up to 24,000 lbs and tandems to 48,000 lbs, depending on the permit and route. Combinations with a tridem or quadrem axle may run up to 88,000 lbs on non-interstate roads, and harvest season permits allow 86,600 lbs for farm and forest products. Any truck exceeding legal or permitted weights is subject to enforcement and fines.

Overweight Fines

Louisiana’s fine schedule for overweight violations is progressive and increases rapidly with the degree of overweight.

  • The minimum fine is $10 for up to 999 lbs over the limit.
  • For 1,000–1,999 lbs over, the fine is $0.01 per lb
  • For 2,000–2,999 lbs over, it is $0.02 per lb
  • For 3,000–3,999 lbs, $0.03 per lb, and so forth, climbing by one cent per pound for each additional 1,000 lbs.

For example, if a truck is 6,500 lbs overweight (in the 6,000–6,999 lb bracket), the fine is $0.06 per lb applied to the entire 6,500 lbs (about $390). At 11,000 lbs or more over, the fine is $0.11 per lb for all of the overweight amount (e.g., 20,000 lbs over equals a $2,200 fine).

There is no statutory maximum, so large violations can result in substantial penalties. Special exemptions exist for some axle-group overages for trucks hauling commodities like concrete, construction aggregates, or solid waste. If only axles are overweight (and not gross), and the truck stays off interstates, no penalty is assessed. However, if gross weight is exceeded or the vehicle is on the interstate, full fines are assessed. Vehicles operating under a permit but still exceeding permitted gross weight are fined on a separate schedule, from $0.02 per lb up to $100 plus $0.05 per lb when more than 10,000 lbs over.

Enforcement

The DOTD Police Weight Enforcement unit (part of Louisiana DOTD, which took over from State Police in 2022) enforces truck weight laws at fixed weigh stations and through mobile patrol units. Commercial vehicles rated one ton or more must stop at stationary scales, often situated on major interstate and state routes. Failing to stop can incur a $500 fine for vehicles over 26,000 lbs GVWR. If a violation is detected, trucks are generally held until the excess is resolved, meaning cargo must be offloaded or the weight issue otherwise addressed on site before travel can continue. Fines are paid to DOTD through its weight citation payment portal, and out-of-state trucks account for most of the penalties assessed. A vehicle that inadvertently bypasses the scales and returns voluntarily is not penalized. Louisiana’s enforcement relies on its network of 17 weigh stations, of which 10 were operating as of a 2026 state audit, plus mobile patrols by DOTD Police and Louisiana State Police. The state’s strict penalty schedule and frequent weight checks are specifically intended to protect its highways and bridges from premature wear and damage.