4 Axle Semi Truck Trailer – Single Drive – Bridge Enter your axle weights and axle spacings to check your compliance with the US Interstate bridge laws. Enter your Axle Weights (enter numbers only) Weight on Steer Axles: Weight on Drive Axles: Weight on Trailer Axles: Distance between Axle 1 and 4 57' or more 56' 55' 54' 53' 52' 51' 50' 49' 48' 47' 46' 45' 44' 43' 42' 41' 40' 39' 38' 37' 36' 35' 34' 33' 32' 31' 30' 29' 28' 27' 26' 25' 24' 23' 22' 21' 20' 19' 18' 17' 16' 15' 14' 13' 12' Distance between Axle 1 and 2 10' 9' between 8' and 9' 4' - 8' Distance between 2 and 4 32' or more 31' 30' 29' 28' 27' 26' 25' 24' 23' 22' 21' 20' 19' 18' 17' 16' 15' 14' 13' 12' 11' 10' 9' between 8' and 9' 8' Distance between 3 and 4 4' - 8' between 8' and 9' 9' 10' Calculate Bridge Compliance
