2023 Wyoming Statutes › Title 31 - Motor Vehicles › Chapter 18 - Commercial Vehicles › Article 8 - Size and Weight Limits › Section 31-18-802 - General Requirements.

31-18-802. General requirements.
(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.