Federal & State Regulations | Size/Weight limits - Massachusetts

Dimension	National Network	State and Other Supplemental Highways
Width:	8' 6"	8' 6"
Height:	13' 6"	13' 6"
Length:	National Network	On All Other
Bus	45'	45'
Articulated bus	60'	60'
Straight Trucks	40'	40'
Straight truck and trailer	60'	60'
Tractor-semitrailer combinations	No limit with legal trailer	No limit with legal trailer
Semitrailer	53'	53'
Tractor-twin-trailer combination	No limit with legal trailers	No limit with legal trailers
Trailers of twin-trailer combinations	28'	28'
Boat-transporter combination	65'	60'
Overhang limitations	3' front, 4' rear	3' front, 4' rear
Stinger-steered boat-transporter	75'	65'
Overhang limitations	3' front, 4' rear	3' front, 4' rear
Auto-transporter	65'	60'
Overhang limitations	3' front, 4' rear	3' front, 4' rear
Stinger-steered auto-transporter	75'	65'
Overhang limitations	3' front, 4' rear	3' front, 4' rear
Saddlemount	75	75
General overhang limitations
Drawbar
Dromedary
Kingpin to rearaxle
Length special limitations or restrictions
Weight:	Interstate and Defense Highways	On All Other
Steer axle
Single axle	22,400 18,000 lb if spaced less than 6' apart	22,400 18,000 lb if spaced less than 6' apart
Tandem axle	34,000	34,000
Tridem axle	36,000	36,000
Gross vehicle weight	80,000	80,000
Load per inch width of tire	800	800
Per wheel
Tolerances	5% on GW with permit	N/S
APU allowance	400	400
Natural gas allowance
Weight special limitations or restrictions

Bridge rules

MAXIMUM GROSS WEIGHT: Any vehicle of combination of vehicles may not travel on the highways in the state without a permit if the overall gross weight on a group of two or more consecutive axles exceeds the weight determined by using the following formula:

where W is the overall gross weight on any group of two or more consecutive axles to the nearest 500 lbs., L is the distance in feet between the extreme of any group of two or more consecutive axles, and N is the number of axles in the group under consideration; except that two consecutive sets of tandem axles may carry a gross load of 34,000 lbs. each providing the overall distance between the first and last axles of such consecutive sets of tandem axles is 36 feet or more. Overall gross weight may not exceed 80,000 lbs.

Gross weight table
Distance in feet between the extremes of any group of 2 or more consecutive axles	Maximum load in pounds carried on any group of 2 or more consecutive axles
	2 axles	3 axles	4 axles	5 axles	6 axles	7 axles
4	34,000
5	35,000
6	36,000
7	37,000
8	38,000	42,000
9	39,000	42,500
10	40,000	43,500
11	41,000	44,000
12	42,000	45,000	50,000
13	43,000	45,500	50,500
14	44,000	46,500	51,500
15	44,800	47,000	52,000
16		48,000	52,500	58,000
17		48,500	53,500	58,500
18		49,500	54,000	59,000
19		50,000	54,500	60,000
20		51,000	55,500	60,500	66,000
21		51,500	56,000	61,000	66,500
22		52,500	56,500	61,500	67,000
23		53,000	57,500	62,000	68,000
24		54,000	58,000	63,000	68,500	74,000
25		54,500	58,500	63,500	69,000	74,500
26		55,500	59,500	64,000	69,500	75,000
27		56,000	60,000	65,000	70,000	75,500
28		57,000	60,500	65,500	71,000	76,500
29		57,500	61,500	66,000	71,500	77,000
30		58,500	62,000	66,500	72,000	77,500
31		59,000	62,500	67,500	72,500	78,000
32		60,000	63,500	68,500	73,000	78,500
33		60,750	64,000	68,500	74,000	79,000
34		61,500	64,500	69,000	74,500	80,000
35		62,250	65,500	70,000	75,000
36		63,000	66,000	70,500	75,500
37		63,750	66,500	71,000	76,000
38		64,500	67,500	72,000	77,000
39		65,250	68,000	72,500	77,500
40		66,000	68,500	73,000	78,000
41		66,750	69,500	73,500	78,500
42		67,200	70,000	74,000	79,000
43			70,500	75,000	80,000
44			71,500	75,500
45			72,000	76,000
46			72,500	76,500
47			73,500	77,500
48			74,000	78,000
49			74,500	78,500
50			75,500	79,000
51			76,000	80,000
52			76,500
53			77,500
54			78,000
55			78,500

Gross weight table
Distance in feet between the extremes of any group of 2 or more consecutive axles	Maximum load in pounds carried on any group of 2 or more consecutive axles
	2 axles	3 axles	4 axles	5 axles	6 axles	7 axles
4	34,000
5	35,000
6	36,000
7	37,000
8	38,000	42,000
9	39,000	42,500
10	40,000	43,500
11	41,000	44,000
12	42,000	45,000	50,000
13	43,000	45,500	50,500
14	44,000	46,500	51,500
15	44,800	47,000	52,000
16		48,000	52,500	58,000
17		48,500	53,500	58,500
18		49,500	54,000	59,000
19		50,000	54,500	60,000
20		51,000	55,500	60,500	66,000
21		51,500	56,000	61,000	66,500
22		52,500	56,500	61,500	67,000
23		53,000	57,500	62,000	68,000
24		54,000	58,000	63,000	68,500	74,000
25		54,500	58,500	63,500	69,000	74,500
26		55,500	59,500	64,000	69,500	75,000
27		56,000	60,000	65,000	70,000	75,500
28		57,000	60,500	65,500	71,000	76,500
29		57,500	61,500	66,000	71,500	77,000
30		58,500	62,000	66,500	72,000	77,500
31		59,000	62,500	67,500	72,500	78,000
32		60,000	63,500	68,500	73,000	78,500
33		60,750	64,000	68,500	74,000	79,000
34		61,500	64,500	69,000	74,500	80,000
35		62,250	65,500	70,000	75,000
36		63,000	66,000	70,500	75,500
37		63,750	66,500	71,000	76,000
38		64,500	67,500	72,000	77,000
39		65,250	68,000	72,500	77,500
40		66,000	68,500	73,000	78,000
41		66,750	69,500	73,500	78,500
42		67,200	70,000	74,000	79,000
43			70,500	75,000	80,000
44			71,500	75,500
45			72,000	76,000
46			72,500	76,500
47			73,500	77,500
48			74,000	78,000
49			74,500	78,500
50			75,500	79,000
51			76,000	80,000
52			76,500
53			77,500
54			78,000
55			78,500

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['Size and Weight Limits']

['Sizes and weights']

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Size/Weight limits - Massachusetts

Bridge rules