Federal & State Regulations | Size & weight limits - California

Dimension	National Network	State and Other Supplemental Highways
Width:	8' 6"	8' 6"
Height:	14'	14'
Length:	National Network	All Highways
Bus
Articulated bus	60'	60'
Straight Trucks	40'	40'
Straight truck and trailer	65'	65'
Tractor-semitrailer combinations	No limit with legal trailer	65' see KPRA
Semitrailer	53' For trailers over 48' see KPRA	No limit On "California legal" routes so long as overall length does not exceed 65' and KPRA compliant
Tractor-twin-trailer combination	No limit if trailers are 28' 6" or less	75' With two 28' 6" trailers. 65' with one 28' 6" trailer and one longer
Trailers of twin-trailer combinations	28' 6"	28' 6"
Boat-transporter combination
Overhang limitations
Stinger-steered boat-transporter
Overhang limitations
Auto-transporter
Overhang limitations
Stinger-steered auto-transporter	70' If kingpin is at least 3' behind rear drive axle. 75' if distance from steering axle to rear drive axle does not exceed 24', kingpin is at least 5' behind rear drive axle and KPRA does not exceed 34' or 36' KPRA of a tridem axle trailer.	70' If kingpin is at least 3' behind rear drive axle. 75' if distance from steering axle to rear drive axle does not exceed 24', kingpin is at least 5' behind rear drive axle and KPRA does not exceed 34' or 36' KPRA of a tridem axle trailer.
Overhang limitations	6' 6" rear	6' 6" rear
Saddlemount	97' up to three vehicles	97' up to three vehicles
General overhang limitations
Drawbar	15'	15'
Dromedary
Kingpin to rearaxle	40' to rear most axle or 38' for semitrailer with one axle	40' or 38' single axle. Some routes restricted to 30'
Length special limitations or restrictions	California is very strict with length and KPRA. Travel not advised if KPRA length is over posted value. A forklift that is lifted off the ground and is being transported on the back of a truck is considered a load. When combination length exceeds 75', the load must be confined within the exterior dimensions of the vehicle. To the rear, the load cannot extend beyond the last point of support for a greater distance than that equal to two-thirds of the length of the wheelbase. The wheelbase of a semitrailer is considered the distance between the rearmost axle of the towing vehicle and the rearmost axle of the semitrailer.
Weight:	Interstate and Defense Highways	All Highways
Steer axle	20,000 There are various exceptions. However, the steer axle must go by the load limit set by the tire manufacturer.	20,000 There are various exceptions – the steering axle, however, must go by the load limit set by the tire manufacturer.
Single axle	20,000 for buses 20,500 lb	20,000 for buses 20,500 lb
Tandem axle	34,000	34,000
Tridem axle
Gross vehicle weight	80,000	80,000
Load per inch width of tire	620	620
Per wheel	10,500 One wheel, or wheels, supporting one end of an axle	10,500 One wheel, or wheels, supporting one end of an axle
Tolerances
APU allowance
Natural gas allowance	2,000 Including a near-zero emission or zero-emission vehicle	2,000 Including a near-zero emission or zero-emission vehicle
Weight special limitations or restrictions

['Size and Weight Limits']

['Sizes and weights']

...

Size & weight limits - California