Alabama DOT Inspection and Motor Carrier Enforcement Guide

Commercial motor vehicle enforcement in Alabama is primarily managed by the Alabama Law Enforcement Agency (ALEA) Marine Police and Highway Patrol divisions, alongside the Alabama Department of Transportation (ALDOT). These agencies enforce the Federal Motor Carrier Safety Regulations (FMCSRs) as adopted under Alabama Administrative Code Chapter 760-X-1. Enforcement focuses on safety compliance, weight limits, and hazardous materials transport across the state's 1,000 miles of interstate, including I-65, I-10, and I-20. Officers conduct North American Standard Inspections to reduce crashes and fatalities involving large trucks and buses.

ALEA Enforcement Authority and Inspection Levels

Alabama utilizes the six standard levels of inspections defined by the Commercial Vehicle Safety Alliance (CVSA). Level I is the most comprehensive, involving a 37-step procedure that includes an examination of the driver's record of duty status and a full mechanical inspection underneath the vehicle. Level II is a walk-around inspection, while Level III focuses solely on driver credentials such as the Commercial Driver’s License (CDL), Medical Examiner’s Certificate, and Skill Performance Evaluation (SPE) certificate. Level IV, V, and VI are reserved for special one-time studies, vehicle-only inspections, and radioactive materials respectively. ALEA officers utilize the Motor Carrier Management Information System (MCMIS) to upload inspection data within 21 days of the event, affecting the carrier's CSA score.

Alabama Weight and Size Limits

Under Alabama Code § 32-9-20, the maximum gross vehicle weight allowed on interstate highways is 80,000 pounds, provided the vehicle meets the bridge formula requirements. Single axle weights are capped at 20,000 pounds, and tandem axles are limited to 34,000 pounds. Vehicle height is restricted to 13 feet 6 inches, and the maximum width is 102 inches. On non-interstate highways, the weight limit can vary, but generally aligns with federal standards to ensure infrastructure preservation. For loads exceeding these dimensions, carriers must obtain an oversize/overweight (OS/OW) permit from ALDOT, which currently costs $10 for a single trip plus additional fees based on weight increments.

Intrastate vs. Interstate Regulations

Alabama distinguishes between intrastate and interstate commerce regarding USDOT number requirements. According to Alabama law, all commercial motor vehicles (CMVs) operating in intrastate commerce with a Gross Vehicle Weight Rating (GVWR) or Gross Combined Weight Rating (GCWR) of 26,001 pounds or more must display a USDOT number. However, if the vehicle transports hazardous materials requiring placarding, a USDOT number is required regardless of weight. Carriers can manage their compliance documents and ensure drivers are following state-specific routing through DispatchTool, which provides truck-safe navigation to avoid restricted routes and low clearances. By keeping all safety records in one platform, fleets can be better prepared for a surprise roadside audit. Create a DispatchTool account to streamline your fleet compliance management.

Common Violation Fines and Penalties

Fines for DOT violations in Alabama vary by jurisdiction but are often significant. A violation for an expired medical card or logs not current can result in fines ranging from $100 to over $500, plus court costs which often exceed $150. Overweight violations are calculated per pound of excess weight: for example, exceeding the limit by 1,000 to 2,000 pounds results in a fine of approximately 1 cent per pound, while exceeding it by over 5,000 pounds can result in a fine of 5 cents per pound. Multiple violations in a single stop can lead to an Out-of-Service (OOS) order, which prevents the vehicle or driver from moving until the safety issue is rectified, leading to significant downtime costs.

Alabama Weigh Station Locations

Alabama operates several fixed weigh stations and scales, notably on I-65 near Athens and I-20/59 near Heflin. These stations utilize Weigh-in-Motion (WIM) technology to prescreen vehicles at highway speeds. If a vehicle is flagged by the WIM sensors or the PrePass system, the driver must pull into the static scales for a formal weighing and potential inspection. The ALEA also employs mobile enforcement units equipped with portable scales that can set up checkpoints on secondary roads such as US-80 or US-231 to prevent carriers from bypassing fixed scale locations. Failure to stop at an open weigh station is a misdemeanor in Alabama and typically results in an immediate pursuit and citation.

IFTA and IRP Enforcement

The Alabama Department of Revenue (ADOR) oversees the International Fuel Tax Agreement (IFTA) and the International Registration Plan (IRP). During a DOT inspection, ALEA officers will verify that the carrier has a valid IFTA decal displayed on both sides of the cab and carries the current IFTA cab card. The current Alabama fuel tax rate for diesel is $0.30 per gallon. Motor carriers must file quarterly tax returns even if no taxable miles were driven. Failure to display valid credentials can result in a $500 fine and the vehicle being grounded until the registration is verified through the IRP clearinghouse.

Safety Audit Requirements

New motor carriers based in Alabama are subject to a New Entrant Safety Audit within the first 12 months of operation. The FMCSA or state partners will review the carrier’s safety management system, including proof of insurance (Form MCS-90), drug and alcohol testing programs, and driver qualification files. According to 49 CFR Part 385, failure to pass this audit or refusal to permit the audit will result in the revocation of the carrier’s USDOT registration. Carriers must maintain a minimum of $750,000 in liability insurance for non-hazardous freight moved in vehicles over 10,000 lbs GVWR.

Sources

Alabama Law Enforcement Agency (ALEA) (2024) — https://www.alea.gov/dps/highway-patrol/motor-carrier-safety-unit Alabama Department of Transportation (ALDOT) Permit Office (2024) — https://www.dot.state.al.us/mntce/overweightPermits.html Federal Motor Carrier Safety Administration (FMCSA) Analysis & Information Online (2024) — https://ai.fmcsa.dot.gov/DataSource/StateOverview.aspx?state=AL

Frequently asked

What is the maximum height for trucks in Alabama?

The maximum legal height for any vehicle on Alabama highways is 13 feet 6 inches. Anything exceeding this height requires a special permit from ALDOT.

Does Alabama require a USDOT number for intrastate carriers?

Yes, Alabama requires a USDOT number for all commercial vehicles operating intrastate with a GVWR of 26,001 lbs or more, or any vehicle carrying hazardous materials.

How much is an overweight ticket in Alabama?

Fines are graduated based on the excess weight. For example, being over the limit by more than 5,000 pounds results in a fine of 5 cents per pound plus court costs, which can total over $400 for a single violation.

Are logs required for short-haul drivers in Alabama?

Drivers who operate within a 150 air-mile radius of their work reporting location and return home within 14 hours may qualify for the short-haul exemption under 49 CFR 395.1, meaning they do not need to maintain a standard ELD log if they keep accurate time records.