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Size/Weight limits - Montana

RegSenseSizes and weightsState InfoBest ResultsFocus AreaMontanaFleet OperationsEnglishSize and Weight LimitsTransportation

DimensionNational NetworkState and Other Supplemental Highways
Width:8' 6"8' 6"
Height:14'14'
Length:National NetworkOn All Others
Bus55'55'
Articulated bus
Straight Trucks55'55'
Straight truck and trailer75'75'
Tractor-semitrailer combinationsNo limit
with legal trailer		No limit
with legal trailer
Semitrailer53'53'
Tractor-twin-trailer combinationNo limit
with legal trailer or 61' combined trailer length		No limit
with legal trailer or 61' combined trailer length
Trailers of twin-trailer combinations28' 6"
or 61' combined		28' 6"
or 61' combined
Boat-transporter combination75'75'
Overhang limitations
Stinger-steered boat-transporter75'75'
Overhang limitations3' front, 4' rear3' front, 4' rear
Auto-transporter75'75'
Overhang limitations
Stinger-steered auto-transporter80'80'
Overhang limitations4' front, 6' rear4' front, 6' rear
Saddlemount75'
up to 3		75'
up to 3
General overhang limitations
Drawbar
Dromedary
Kingpin to rearaxle
Length special limitations or restrictions
Weight: Interstate and Defense HighwaysOn All Others
Steer axleN/SN/S
Single axle20,000
Axles over 11,000 pounds must have 4 tires or wide-base tires		20,000
Axles over 11,000 pounds must have 4 tires or wide-base tires
Tandem axle34,00034,000
Tridem axle42,00042,000
Gross vehicle weight80,000131,060
based on bridge formula
example: 9 axles over 105’
Load per inch width of tire500
must be wide-based tires		500
must be wide-based tires
Per wheel
Tolerances10%
$10 trip permit fee charged. Permit only available to first location to reduce to legal weights.		10%
$10 trip permit fee charged. Permit only available to first location to reduce to legal weights.
APU allowance
Natural gas allowance
Weight special limitations or restrictions

*A vehicle traveling on US93 from the border between Canada and the United States to 10 miles south of the border or on Montana highway 16 from the border between Canada and the United States to 20 miles south of the border is subject to the maximum allowable gross weight limits but is not subject to weight limits determined by the state bridge formula.

Bridge rules

Carriers must apply the Federal Bridge Formula when determining axle weights and spacings:



where W equals 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 extremes of any group of two or more consecutive axles, and N equals 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, provided the overall distance between the first and last axles of such consecutive sets of tandem axles is 36 feet or more.

OVERWEIGHT/RESTRICTED ROUTE WEIGHT CHARTS:

Gross vehicle weight chart — 2 - 11 axles 4 - 38 feet
FT2 Axles3 Axles4 Axles5 Axles6 Axles7 Axles8 Axles9 Axles10 Axles11 Axles
434000
534000
634000
734000
83800042000
93900042750
104000043500
11442504933054870
12450005000055500
13457505066056120
14465005133056750
15472505200057370
16480005266058000
17487505333058620
18495005400059250
19502505466059870
2051000553306050066000
2151750560006112066600
2252500566606175067200
2353250573306237067800
245400058000630006840074000
255475058660636206900074580
265550059330642506960075160
275625060000648707020075750
28570006066065500708007633082000
29577506133066120714007691082570
30585006200066750720007750083140
31592506266067370726007808083710
326000063330680007320078660842809000095770101600
3364000686207380079250848509056096330102150
3464660692507440079830854209112096880102700
3565330698707500080410860009168097440103250
3668000705007560081000865709225098000103800
3768000711207620081580871409281098550104350
3868000717507680082160877109337099110104900
Compute to the nearest “0” inches by the formula in section 61-10-107, MCA.
Formula: W=500 (LN/(N - 1) + 12N + 36) in which W = gross weight, L = wheel base in feet, and N = number of axles
The formula provides for maximum gross weight allowed on any vehicle or combination of vehicles, and maximum gross weight for any groups of axles. No tandem axle to exceed 34,000 pounds. No single axle to exceed 20,000 pounds.
Maximum gross weight for reducible loads is 131,060 pounds.
A vehicle traveling on US93 from the border between Canada and the United States to 10 miles south of the border or on Montana highway 16 from the border between Canada and the United States to 20 miles south of the border is subject to the maximum allowable gross weight limits but is not subject to weight limits determined by the state bridge formula.

Gross vehicle weight chart — 2 - 11 axles 4 - 38 feet
FT2 Axles3 Axles4 Axles5 Axles6 Axles7 Axles8 Axles9 Axles10 Axles11 Axles
434000
534000
634000
734000
83800042000
93900042750
104000043500
11442504933054870
12450005000055500
13457505066056120
14465005133056750
15472505200057370
16480005266058000
17487505333058620
18495005400059250
19502505466059870
2051000553306050066000
2151750560006112066600
2252500566606175067200
2353250573306237067800
245400058000630006840074000
255475058660636206900074580
265550059330642506960075160
275625060000648707020075750
28570006066065500708007633082000
29577506133066120714007691082570
30585006200066750720007750083140
31592506266067370726007808083710
326000063330680007320078660842809000095770101600
3364000686207380079250848509056096330102150
3464660692507440079830854209112096880102700
3565330698707500080410860009168097440103250
3668000705007560081000865709225098000103800
3768000711207620081580871409281098550104350
3868000717507680082160877109337099110104900
Compute to the nearest “0” inches by the formula in section 61-10-107, MCA.
Formula: W=500 (LN/(N - 1) + 12N + 36) in which W = gross weight, L = wheel base in feet, and N = number of axles
The formula provides for maximum gross weight allowed on any vehicle or combination of vehicles, and maximum gross weight for any groups of axles. No tandem axle to exceed 34,000 pounds. No single axle to exceed 20,000 pounds.
Maximum gross weight for reducible loads is 131,060 pounds.
A vehicle traveling on US93 from the border between Canada and the United States to 10 miles south of the border or on Montana highway 16 from the border between Canada and the United States to 20 miles south of the border is subject to the maximum allowable gross weight limits but is not subject to weight limits determined by the state bridge formula.

Gross vehicle weight chart — 4 - 14 axles & 39 - 79 feet
FT4 Axles5 Axles6 Axles7 Axles8 Axles9 Axles10
Axles		11 Axles12
Axles		13
Axles		14 Axles
3968000723707740082750882809393099660105450111270117120123000
40686607300078000833308885094500100220106000111810117660123530
41693307362078600839108942095060100770106550112360118200124070
42700007425079200845009000095620101330107100112900118750124610
43706607487079800850809057096180101880107650113450119290125150
44713307550080400856609114096750102440108200114000119830125690
45720007612081000862509171097310103000108750114540120370126230
46726607675081600868309228097870103550109300115090120910126760
47733307737082200874109285098430104110109850115630121450127300
48740007800082800880009342099000104660110400116180122000127840
49746607862083400885809400099560105220110950116720122540128380
507533079250840008916094570100120105770111500117270123080128920
517600079870846008975095140100680106330112050117810123620129460
527666080500852009033095710101250106880112600118360124160130000
537733081120858009091096280101810107440113150118900124700130530
547800081750864009150096850102370108000113700119450125250131070
557866082370870009208097420102930108550114250120000125790
567933083000876009266098000103500109110114800120540126330
578000083620882009325098570104060109660115350121090126870
5884250888009383099140104620110220115900121630127410
5984870894009441099710105180110770116450122180127950
60855009000095000100280105750111330117000122720128500
61861209060095580100850106310111880117550123270129040
62867509120096160101420106870112440118100123810129580
63873709180096750102000107430113000118650124360130120
6488000924009733010257010800113550119200124900130660
65886209300097910103140108560114110119750125450131200
66892509360098500103710109120114660120300126000
67898709420099080104280109680115220120850126540
68905009480099660104850110250115770121400127090
699112095400100250105420110810116330121950127630
709175096000100830106000111370116880122500128180
719237096600101410106570111930117440123050128720
729300097200102000107140112500118000123600129270
739362097800102580107710113060118550124150129810
749425098400103160108280113620119110124700130360
759487099000103750108850114180119660125250130900
769550099600104330109420114750120220125800131450
7796120100200104910110000115310120770126350
7896750100800105500110570115870121330126900
7997370101400106080111140116430121880127450

Gross vehicle weight chart — 4 - 14 axles & 39 - 79 feet
FT4 Axles5 Axles6 Axles7 Axles8 Axles9 Axles10
Axles		11 Axles12
Axles		13
Axles		14 Axles
3968000723707740082750882809393099660105450111270117120123000
40686607300078000833308885094500100220106000111810117660123530
41693307362078600839108942095060100770106550112360118200124070
42700007425079200845009000095620101330107100112900118750124610
43706607487079800850809057096180101880107650113450119290125150
44713307550080400856609114096750102440108200114000119830125690
45720007612081000862509171097310103000108750114540120370126230
46726607675081600868309228097870103550109300115090120910126760
47733307737082200874109285098430104110109850115630121450127300
48740007800082800880009342099000104660110400116180122000127840
49746607862083400885809400099560105220110950116720122540128380
507533079250840008916094570100120105770111500117270123080128920
517600079870846008975095140100680106330112050117810123620129460
527666080500852009033095710101250106880112600118360124160130000
537733081120858009091096280101810107440113150118900124700130530
547800081750864009150096850102370108000113700119450125250131070
557866082370870009208097420102930108550114250120000125790
567933083000876009266098000103500109110114800120540126330
578000083620882009325098570104060109660115350121090126870
5884250888009383099140104620110220115900121630127410
5984870894009441099710105180110770116450122180127950
60855009000095000100280105750111330117000122720128500
61861209060095580100850106310111880117550123270129040
62867509120096160101420106870112440118100123810129580
63873709180096750102000107430113000118650124360130120
6488000924009733010257010800113550119200124900130660
65886209300097910103140108560114110119750125450131200
66892509360098500103710109120114660120300126000
67898709420099080104280109680115220120850126540
68905009480099660104850110250115770121400127090
699112095400100250105420110810116330121950127630
709175096000100830106000111370116880122500128180
719237096600101410106570111930117440123050128720
729300097200102000107140112500118000123600129270
739362097800102580107710113060118550124150129810
749425098400103160108280113620119110124700130360
759487099000103750108850114180119660125250130900
769550099600104330109420114750120220125800131450
7796120100200104910110000115310120770126350
7896750100800105500110570115870121330126900
7997370101400106080111140116430121880127450

Gross vehicle weight chart — 5 - 11 axles & 80 - 121 feet
FT5 Axles6 Axles7 Axles8 Axles9 Axles10 Axles11Axles
8098000102000106660111710117000122440128000
8198620102600107250112280117560123000128550
8299250103200107830112850118120123550129100
8399870103800108410113420118680124110129650
84104400109000114000119250124660130200
85105000109580114570119810125220130750
86105600110160115140120370125770131300
87106200110750115710120930126330
88106800111330116280121500126880
89107400111910116850122060127440
90108000112500117420122620128000
91108600113080118000123180128550
92109200113660118570123750129110
93109800114250119140124310129660
94110400114830119710124870130220
95115410120280125430130770
96116000120850126000131330
97116580121420126560
98117160122000127120
99117750122570127680
100118330123140128250
101118910123710128810
102119500124280129370
103120080124850129930
104120660125420130500
105121250126000131060
106121830126570
107122410127140
108123000127710
109123580128280
110124160128850
111124750129420
112125330130000
113125910130570
114126500131140
115127080
116127660
117128250
118128830
119129410
120130000
121130580

Gross vehicle weight chart — 5 - 11 axles & 80 - 121 feet
FT5 Axles6 Axles7 Axles8 Axles9 Axles10 Axles11Axles
8098000102000106660111710117000122440128000
8198620102600107250112280117560123000128550
8299250103200107830112850118120123550129100
8399870103800108410113420118680124110129650
84104400109000114000119250124660130200
85105000109580114570119810125220130750
86105600110160115140120370125770131300
87106200110750115710120930126330
88106800111330116280121500126880
89107400111910116850122060127440
90108000112500117420122620128000
91108600113080118000123180128550
92109200113660118570123750129110
93109800114250119140124310129660
94110400114830119710124870130220
95115410120280125430130770
96116000120850126000131330
97116580121420126560
98117160122000127120
99117750122570127680
100118330123140128250
101118910123710128810
102119500124280129370
103120080124850129930
104120660125420130500
105121250126000131060
106121830126570
107122410127140
108123000127710
109123580128280
110124160128850
111124750129420
112125330130000
113125910130570
114126500131140
115127080
116127660
117128250
118128830
119129410
120130000
121130580

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['Size and Weight Limits']
['Sizes and weights']
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