General requirements.
Wyo. Stat. Ann. § 31-18-802
in effect(a) All vehicles operated on the highways of this state shall comply with the following:
(i) Width-all highways:
(A) No vehicle, unladen or with load or load-holding device thereon shall exceed one hundred two (102) inches in width. Notwithstanding the foregoing, appurtenances on noncommercial motor homes, house trailers and truck campers may exceed one hundred two (102) inches in width if they extend no further than the exterior rear view mirrors of the motor home, tow vehicle or pickup truck, in the case of a truck camper, provided such mirrors only extend the distance necessary to provide the required field of view for the vehicle before the appurtenances were attached.
(ii) Height-all highways:
(A) No vehicle, unladen or with load or load-holding devices thereon, shall exceed fourteen (14) feet in height.
(iii) Notwithstanding paragraphs (i) and (ii) of this subsection, implements and produce of husbandry of greater widths or greater heights may be moved in agricultural operations during daylight hours, without a permit or fee, but subject to and in accordance with regulations promulgated by the department for the protection of persons, property, highways and bridges. Regarding movement of implements of husbandry not exceeding sixteen (16) feet in width or height, the rules and regulations shall:
(A) Not require the use of escort vehicles provided the implement is kept to the right of the center line;
(B) Require the display of an oversize vehicle sign and warning lights as approved by the department.
(iv) Length-all highways, except as provided in 31-18-803(a):
(A) No combination of vehicles shall consist of more than three (3) single vehicles. No single vehicle shall have an overall length in excess of sixty (60) feet;
(B) In a truck-tractor semitrailer combination, no semitrailer shall exceed sixty (60) feet in length. In a truck-tractor, semitrailer, trailer combination or truck-tractor double semitrailer combination, the length of the semitrailer shall not exceed forty-eight (48) feet and the length of the trailer or second semitrailer shall not exceed forty (40) feet. The combined length of the semitrailer and trailer or semitrailer shall not exceed eighty-one (81) feet including connecting mechanisms. For any other combination of vehicles the overall length shall not exceed eighty-five (85) feet;
(C) In a truck-tractor, semitrailer, trailer or double semitrailer combination, the heavier towed vehicle shall be directly behind the truck-tractor and the lighter towed vehicle shall be last if the weight difference between consecutive towed vehicles exceeds five thousand (5,000) pounds.
(v) Weights:
(A) The wheels of all vehicles except those operated at a speed of less than ten (10) miles per hour shall be equipped with pneumatic tires;
(B) No wheel equipped with solid tires shall carry a load in excess of eight thousand (8,000) pounds;
(C) No wheel shall carry a load in excess of ten thousand (10,000) pounds. No tire on a steering axle shall carry a load in excess of seven hundred fifty (750) pounds per inch of tire width and no other tire on a vehicle shall carry a load in excess of six hundred (600) pounds per inch of tire width. "Tire width" means the width stamped on the tire by the manufacturer;
(D) No single axle shall carry a load in excess of twenty thousand (20,000) pounds;
(E) No tandem axle shall carry a load in excess of thirty-six thousand (36,000) pounds and no one (1) axle of any group of two (2) consecutive axles shall exceed the weight permitted on a single axle;
(F) No triple axle, consisting of three (3) consecutive load bearing axles that articulate from an attachment to the vehicle including a connecting mechanism or variable load suspension axle to keep all axles at or below legal limits, having a spacing between the first and third axles greater than ninety-six (96) inches and not more than one hundred two (102) inches, shall carry a load in excess of forty-two thousand (42,000) pounds;
(G) Subject to the limitation imposed by the axle load, no vehicle or combination of vehicles shall be operated on the interstate or national defense highways exceeding the maximum weight allowed under federal law and unless in compliance with Table I corresponding to a distance in feet between the extremes of any axle groups measured longitudinally to the nearest foot except that vehicles with two (2) consecutive sets of tandem axles may carry a gross load of thirty-six thousand (36,000) pounds each if the distance between the first and last axles of the consecutive sets of tandem axles is thirty-six (36) feet or more;
(H) Vehicles operating on primary and secondary highways may operate in accordance with Table I or Table II at the discretion of the operator as follows:
(I) For vehicles operating under gross weight Table I, the total gross weight in pounds imposed on the highway by any group of two (2) or more consecutive axles on a vehicle or combination of vehicles shall not exceed the value given in gross weight Table I, corresponding to a distance in feet between the extremes of any axle groups measured longitudinally to the nearest foot except that two (2) consecutive sets of tandem axles may carry a gross load of thirty-six thousand (36,000) pounds each if the distance between the first and last axles of the consecutive sets of tandem axles is thirty-six (36) feet or more;
(II) For vehicles operating under the provisions of gross weight Table II, the total gross weight in pounds imposed on the highway by a vehicle or combination of vehicles shall not exceed the value given in gross weight Table II, corresponding to the distance in feet between the extremes of the vehicle or combination of vehicles measured longitudinally to the nearest foot;
(III) Vehicles with two (2) consecutive sets of tandem axles with a distance of less than twenty-two (22) feet between the first and last axles of the consecutive sets shall comply with gross weight Table I.
(J) A variable load suspension axle shall produce a distribution of weight to prevent an axle or axle group from exceeding allowable weights as specified in this paragraph. Dummy axles shall not be considered in the determination of allowable weights;
(K) The following general formula is applied in preparing gross weight Table I:
W=500[LN/(N - 1) + 12N + 36]
Where:
W = overall gross weight on any group of two (2) or more consecutive axles to the nearest five hundred (500) pounds.
L = distance in feet between extremes of any group of two (2) or more consecutive axles.
N = number of axles in the group under consideration.
(vi) GROSS WEIGHT TABLE I
____________________________________________________________
Distance in feet
Maximum gross weight in pounds
between the extremes (2) or
carried on any group of two
of any group of two (2) more consecutive axles
or more consecutive
axles
____________________________________________________________
2
3
4
5
6
7
8
9 or
more
axles
axles
axles
axles
axles
axles
axles
axles
________________________________________________________________
4
36,000
5
36,000
6
36,000
7
36,000
8
36,000
42,000
9
39,000
42,500
10
40,000
43,500
11
44,000
12
45,000
50,000
13
45,500
50,500
14
46,500
51,500
15
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
62,500
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
76,000
28
57,000
60,500
65,500
71,000
76,500
82,000
29
57,500
61,500
66,000
71,500
77,000
82,500
30
58,500
62,000
66,500
72,000
77,500
83,000
31
59,000
62,500
67,500
72,500
78,000
83,500
32
60,000
63,500
68,000
73,000
78,500
84,500
90,000
33
64,000
68,500
74,000
79,000
85,000
90,500
34
64,500
69,000
74,500
80,000
85,500
91,000
35
65,500
70,000
75,000
80,500
86,000
91,500
36
Two (2)
consecutive
66,000
70,500
75,500
81,000
86,500
92,000
37
sets of
tandem
66,500
71,000
76,000
81,500
87,000
93,000
38
axles
may carry 67,500
72,000
77,000
82,000
87,500
93,500
39
36,000
pounds
68,000
72,500
77,500
82,500
88,500
94,000
40
each if
the
68,500
73,000
78,000
83,500
89,000
94,500
41
distance
is 36
69,500
73,500
78,500
84,000
89,500
95,000
42
feet or more
70,000
74,000
79,000
84,500
90,000
95,500
43
between
the
70,500
75,000
80,000
85,000
90,500
96,000
44
consecutive
sets
71,500
75,500
80,500
85,500
91,000
96,500
45
of tandem
axles
72,000
76,000
81,000
86,000
91,500
97,500
46
72,500
76,500
81,500
87,000
92,500
98,000
47
73,500
77,500
82,000
87,500
93,000
98,500
48
74,000
78,000
83,000
88,000
93,500
99,000
49
74,500
78,500
83,500
88,500
94,000
99,500
50
75,500
79,000
84,000
89,000
94,500
100,000
51
76,000
80,000
84,500
89,500
95,000
100,500
52
76,500
80,500
85,000
90,500
95,500
101,000
53
77,500
81,000
86,000
91,000
96,500
102,000
54
78,000
81,500
86,500
91,500
97,000
102,500
55
78,500
82,500
87,000
92,000
97,500
103,000
56
79,500
83,000
87,500
92,500
98,000
103,500
57
80,000
83,500
88,000
93,000
98,500
104,000
58
84,000
89,000
94,000
99,000
104,500
59
85,000
89,500
94,500
99,500
105,000
60
85,500
90,000
95,000
100,500
105,500
61
86,000
90,500
95,500
101,000
106,000
62
87,000
91,000
96,000
101,500
107,000
63
87,500
92,000
97,000
102,000
107,500
64
88,000
92,500
97,500
102,500
108,000
65
88,500
93,000
98,000
103,000
108,500
66
89,000
93,500
98,500
104,000
109,000
67
90,000
94,000
99,000
104,500
110,000
68
90,500
95,000
99,500
105,000
110,500
69
91,000
95,500
100,000
105,500
111,000
70
92,000
96,000
101,000
106,000
111,500
71
92,500
96,500
101,500
106,500
112,000
72
93,000
97,000
102,000
107,000
112,500
73
93,500
98,000
102,500
107,500
113,000
74
94,500
98,500
103,000
108,500
113,500
75
95,000
99,000
104,000
109,000
114,000
76
95,500
99,500
104,500
109,500
115,000
77
96,000
100,000
105,000
110,000
115,500
78
97,000
101,000
105,500
110,500
116,000
79
97,500
101,500
106,000
111,000
116,500
80
98,000
102,000
106,500
111,500
117,000
81
98,500
102,500
107,000
112,000
82
99,000
103,000
108,000
113,000
83
100,000
104,000
108,500
113,500
84
104,500
109,000
114,000
85
105,000
109,500
114,500
86
105,500
110,000
115,000
87
106,000
111,000
115,500
88
107,000
111,500
116,000
89
107,500
112,000
117,000
90
108,000
112,500
91
108,500
113,000
92
109,000
113,500
93
110,000
114,000
94
110,500
115,000
95
111,000
115,500
or more
(vii) GROSS WEIGHT TABLE II
PRIMARY AND SECONDARY HIGHWAYS
Distance in feet between the
extremes of the first and Maximum gross
last axle of any vehicle weight in
or combinations of vehicles pounds
10 43,500
11 45,000
12 48,000
13 50,000
14 52,000
15 54,000
16 54,000
17 54,000
18 56,000
19 58,000
20 62,000
21 64,000
22 65,000
23 66,000
24 66,000
25 66,000
26 66,000
27 66,000
28 66,000
29 66,000
30 67,000
31 68,000
32 69,000
33 70,000
34 71,000
35 72,000
36 73,000
37 74,000
38 75,000
39 76,000
40 76,000
41 76,000
42 76,000
43 76,000
44 76,000
45 77,000
46 77,400
47 78,300
48 or more 80,000
(viii) The director may reduce the maximum allowable axle loads and gross weight limits for specific highways or sections thereof or for bridges under his jurisdiction if the continued operation of vehicles or combinations of vehicles would create undue damage to the highways or bridges. Any person owning or operating a vehicle or combination of vehicles in violation of reduced load limits when posted or otherwise appropriately marked is liable for damage to the highway or bridge in question in addition to the penalties provided by law;
(ix) There is no obligation on the state to heighten any bridge, tunnel or other structure on highways because of the provisions of this act. The director may reduce the size and weight limits of vehicles and loads on state and federal highways if, in his discretion, road conditions require;
(x) A board of county commissioners may by resolution adopt any or all of the provisions of this act to apply to county roads under their jurisdiction. The sheriff shall have enforcement authority on county roads under W.S. 31-18-805 for provisions adopted.
Source: WY Statutes (Official Site)URL: https://wyoleg.gov/statutes/compress/title31.pdfFetched: 10/4/2026