How Heavy Is Too Heavy? States Reconsider Truck Weight Limits
States are creating targeted exceptions that allow heavier truck loads for specific industries and commodities, prompting renewed concerns from the Owner-Operator Independent Drivers Association about roadway safety, bridge stress and long-term infrastructure costs.
OOIDA Raises Safety and Infrastructure Concerns
OOIDA points to research from the Transportation Research Board and the U.S. Department of Transportation that raises concerns about increasing truck weights. The research emphasizes the potential effects of heavier vehicles on roadway safety and the condition of roads and bridges.
Supporters of heavier loads argue that allowing trucks to carry more milk, grain and other commodities could reduce the number of trips required to move freight. Critics, including OOIDA, warn that heavier vehicles could increase safety risks and accelerate wear on pavement, bridges and overpasses.
States Target Specific Loads
The debate has not prevented states from adopting new weight exceptions. Rather than changing truck weight limits for all vehicles, lawmakers have focused on specific industries, commodities and types of freight.
Roadways are designed to withstand only a certain amount of weight, with bridges and overpasses often representing the most vulnerable points along a route. As a result, a vehicle’s allowable weight can be limited by the weakest structure on the roadway.
Weigh-in-Motion Systems Expand
Weigh-in-motion systems are increasingly being used to monitor truck weights without requiring every vehicle to stop at a static scale. Sensors installed in the roadway measure axle weights as trucks travel at highway speeds.
In states with advanced systems, the technology can process as much as 80 percent of passing traffic without a full stop. Trucks identified as potential weight violations may then be directed to static scales for additional inspection.
Understanding Gross Vehicle Weight
Gross vehicle weight, or GVW, refers to the total weight of a loaded truck, including the vehicle itself, its cargo, fuel and equipment. Each truck has a maximum GVW, and the loaded vehicle must remain within that limit as well as any applicable roadway, bridge and axle-weight restrictions.
The continuing expansion of commodity-specific weight exemptions is expected to keep the balance between freight efficiency, enforcement and infrastructure preservation at the center of the trucking industry’s weight-limit debate.
