Federal truck size and weight limits

Size and weight limits set in 23 CFR Part 658.

31 records

State codeLimit keyLimit valueLimit unitHighway class
FEDERAL 65813_b1_semitrailer_min 48 feet minimum semitrailer length National Network and qualifying access/transit
FEDERAL 65813_b2_double_trailer_min 28 feet minimum per semitrailer or trailer National Network and qualifying access/transit
FEDERAL 65813_b5_grandfathered_trailer 28.5; 65 feet trailer/semitrailer; feet overall combination maximum 1982-12-01 lawful operation; National Network/access
FEDERAL 65813_d_bus_min 45 feet minimum bus length National Network
FEDERAL 65813_e1i_auto_transporter 65; 75 feet overall length; traditional; stinger-steered National Network automobile transporters
FEDERAL 65813_e1ii_auto_overhang 3 front; 4 rear feet overhang National Network automobile transporters
FEDERAL 65813_e1iii_saddlemount 97 feet overall length Drive-away saddlemount combinations; up to 3 saddlemounted vehicles and 1 fullmount; National Network
FEDERAL 65813_e2i_boat_transporter 65; 75; 65 feet overall length; traditional; stinger-steered; truck-trailer National Network boat transporters
FEDERAL 65813_e2ii_boat_overhang 3 front; 4 rear feet overhang National Network boat transporters
FEDERAL 65813_e3i_b_train 28; 28.5 feet per semitrailer; 28.5 if grandfathered National Network truck-tractor semitrailer-semitrailer
FEDERAL 65813_e3ii_b_train_no_semitrailer 48 feet length limitation National Network B-train without semitrailer mounted to B-train assembly
FEDERAL 65813_e4_maxi_cube 34; 60; 65 feet cargo box; box-to-box; overall National Network maxi-cube vehicles
FEDERAL 65813_e5i_beverage_kingpin 28 feet maximum kingpin-to-rear distance National Network beverage semitrailers
FEDERAL 65813_e6_munitions 75 feet minimum overall combination length National Network specified munitions carriers
FEDERAL 65813_g_motorsports 46 feet minimum kingpin-to-rear-axle-center distance National Network motorsports vehicle transporters
FEDERAL 65813_h_nebraska_custom_harvester 81 feet 6 inches feet maximum overall length Nebraska custom-harvester combinations during harvest months
FEDERAL 65815_a_width 102; 2.6; 102.36; Hawaii 108 inches; meters; inches; inches National Network vehicles; Hawaii exception
FEDERAL 65817_b_gross_vehicle 80000 pounds maximum gross vehicle weight Interstate System and reasonable access; lower if bridge formula dictates
FEDERAL 65817_c_single_axle 20000 pounds maximum gross weight on one axle Interstate System and reasonable access
FEDERAL 65817_d_tandem_axle 34000 pounds maximum gross weight on tandem axles Interstate System and reasonable access
FEDERAL 65817_e_bridge_formula W = 500[(LN/(N-1)) + 12N + 36]; 80,000 cap pounds; formula Interstate highways; two tandem sets may each carry 34,000 lb if first-to-last axle distance is at least 36 feet
FEDERAL 65817_f_enforcement_floors 20,000 single; 34,000 tandem; 500 per inch tire; 20,000 steering or manufacturer rating lower pounds; pounds per inch Interstate System enforcement floors and tolerances
FEDERAL 65817_k_special_bus 24000 pounds minimum single-axle limit Specified over-the-road or intrastate public-agency transit buses meeting historical State condition
FEDERAL 65817_n_apu 400 pounds additional allowance maximum Qualifying auxiliary-power or idle-reduction technology; certification/proof conditions
AL tandem_axle_non_interstate 36000 lb non-Interstate highways
AL gross_weight_non_interstate_6plus_axles 84000 lb non-Interstate highways; 6 or more axles
IN tandem_axle_heavy_duty 36000 lb Heavy Duty Highways; 18,000 lb per axle
IN gross_weight_extra_heavy_duty 134000 lb Extra Heavy Duty Highways
KY gross_weight_class_aaa 80000 lb Class AAA highways
NH gross_weight_non_interstate 99000 lb non-Interstate highways
OH tridem_axle_non_interstate 48000 lb non-Interstate highways

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