WY Stat § 31-18-802 (2021)
2021 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.