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 The Federal Bridge Gross Weight Formula, also known as Bridge Formula B or the Federal Bridge Formula, is a mathematical formula in use in the United States by truck drivers and Department of Transportation (DOT) officials to determine the appropriate maximum gross weight for a commercial motor vehicle (CMV) based on axle number and spacing. The formula is part of federal weight and size regulations regarding interstate commercial traffic (intrastate traffic is subject to state limits). The formula is necessary to prevent heavy vehicles from damaging roads and bridges. CMVs are most often tractortrailers or buses, but the formula is of most interest to truck drivers due to the heavy loads their vehicles often carry. Early 20thcentury weight limits were enacted to protect dirt and gravel roads from damage caused by the solid wheels of heavy trucks. As time passed, truck weight limits focused primarily on gross weight limits (which had no prescribed limits on length). By 1974, bridges received special protection from increasing truck weight limits. The bridge formula law was enacted by the U.S. Congress to limit the weighttolength ratio of heavy trucks, and to protect roads and bridges from the damage caused by the concentrated weight of shorter trucks. The formula effectively lowers the legal weight limit for shorter trucks, preventing them from causing premature deterioration of bridges and highway infrastructure. Compliance with the law is checked when vehicles pass through a weigh station, often located at the borders between states or on the outskirts of major cities, where the vehicle may be weighed and measured. The one exception to the formula allows a standard fiveaxle semitruck configuration to weigh the maximum legal gross weight. This exception was specifically requested by the American Trucking Associations to allow tank trucks to reach the maximum legal gross weight without violating the bridge formula law. (en)
 La Federal Bridge Gross Weight Formula est une formule mathématique utilisée par les chauffeurs de poids lourd américains et les agents du Département des Transports des ÉtatsUnis se basant sur l'empattement pour déterminer le poids maximum autorisé des véhicules de transport routier. La formule est notamment utile pour éviter que les poids lourds n'endommagent les routes et les ponts. Les véhicules concernés sont le plus souvent des semiremorques ou des autobus, mais la formule est utile aux conducteurs de camions classiques en raison des lourdes charges dont leurs véhicules sont souvent porteurs. (fr)

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 La Federal Bridge Gross Weight Formula est une formule mathématique utilisée par les chauffeurs de poids lourd américains et les agents du Département des Transports des ÉtatsUnis se basant sur l'empattement pour déterminer le poids maximum autorisé des véhicules de transport routier. La formule est notamment utile pour éviter que les poids lourds n'endommagent les routes et les ponts. Les véhicules concernés sont le plus souvent des semiremorques ou des autobus, mais la formule est utile aux conducteurs de camions classiques en raison des lourdes charges dont leurs véhicules sont souvent porteurs. (fr)
 The Federal Bridge Gross Weight Formula, also known as Bridge Formula B or the Federal Bridge Formula, is a mathematical formula in use in the United States by truck drivers and Department of Transportation (DOT) officials to determine the appropriate maximum gross weight for a commercial motor vehicle (CMV) based on axle number and spacing. The formula is part of federal weight and size regulations regarding interstate commercial traffic (intrastate traffic is subject to state limits). The formula is necessary to prevent heavy vehicles from damaging roads and bridges. CMVs are most often tractortrailers or buses, but the formula is of most interest to truck drivers due to the heavy loads their vehicles often carry. (en)

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 Federal Bridge Gross Weight Formula (en)
 Federal Bridge Gross Weight Formula (fr)

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