MO Rev Stat § 304.180 (2021)
2021 Missouri Revised Statutes|Title XIX - Motor Vehicles, Watercraft and Aviation|Chapter 304 - Traffic Regulations|Section 304.180 - Regulations as to weight — axle load, tandem axle defined — transport of specific items, total gross weight permitted — requirements during disasters — emergency vehicles, maximum gross weight — natural gas fueled vehicles, increase in maximum gross weight, when.

Effective - 28 Aug 2020, 7 histories   304.180. Regulations as to weight — axle load, tandem axle defined — transport of specific items, total gross weight permitted — requirements during disasters — emergency vehicles, maximum gross weight — natural gas fueled vehicles, increase in maximum gross weight, when. — 1. No vehicle or combination of vehicles shall be moved or operated on any highway in this state having a greater weight than twenty thousand pounds on one axle, no combination of vehicles operated by transporters of general freight over regular routes as defined in section 390.020 shall be moved or operated on any highway of this state having a greater weight than the vehicle manufacturer's rating on a steering axle with the maximum weight not to exceed twelve thousand pounds on a steering axle, and no vehicle shall be moved or operated on any state highway of this state having a greater weight than thirty-four thousand pounds on any tandem axle; the term "tandem axle" shall mean a group of two or more axles, arranged one behind another, the distance between the extremes of which is more than forty inches and not more than ninety-six inches apart.  2. An "axle load" is defined as the total load transmitted to the road by all wheels whose centers are included between two parallel transverse vertical planes forty inches apart, extending across the full width of the vehicle.  3. Subject to the limit upon the weight imposed upon a highway of this state through any one axle or on any tandem axle, the total gross weight with load imposed by any group of two or more consecutive axles of any vehicle or combination of vehicles shall not exceed the maximum load in pounds as set forth in the following table:   Distance in feet between the extremes of any group of two or more consecutive axles, measured to the nearest foot, except where indicated otherwise     Maximum load in pounds   feet 2 axles 3 axles 4 axles 5 axles 6 axles   4 34,000       5 34,000       6 34,000       7 34,000       8 34,000 34,000      More than 8 38,000 42,000      9 39,000 42,500      10 40,000 43,500      11 40,000 44,000      12 40,000 45,000 50,000     13 40,000 45,500 50,500     14 40,000 46,500 51,500     15 40,000 47,000 52,000     16 40,000 48,000 52,500 58,000    17 40,000 48,500 53,500 58,500    18 40,000 49,500 54,000 59,000    19 40,000 50,000 54,500 60,000    20 40,000 51,000 55,500 60,500 66,000   21 40,000 51,500 56,000 61,000 66,500   22 40,000 52,500 56,500 61,500 67,000   23 40,000 53,000 57,500 62,500 68,000   24 40,000 54,000 58,000 63,000 68,500   25 40,000 54,500 58,500 63,500 69,000   26 40,000 55,500 59,500 64,000 69,500   27 40,000 56,000 60,000 65,000 70,000   28 40,000 57,000 60,500 65,500 71,000   29 40,000 57,500 61,500 66,000 71,500   30 40,000 58,500 62,000 66,500 72,000   31 40,000 59,000 62,500 67,500 72,500   32 40,000 60,000 63,500 68,000 73,000   33 40,000 60,000 64,000 68,500 74,000   34 40,000 60,000 64,500 69,000 74,500   35 40,000 60,000 65,500 70,000 75,000   36  60,000 66,000 70,500 75,500   37  60,000 66,500 71,000 76,000   38  60,000 67,500 72,000 77,000   39  60,000 68,000 72,500 77,500   40  60,000 68,500 73,000 78,000   41  60,000 69,500 73,500 78,500   42  60,000 70,000 74,000 79,000   43  60,000 70,500 75,000 80,000   44  60,000 71,500 75,500 80,000   45  60,000 72,000 76,000 80,000   46  60,000 72,500 76,500 80,000   47  60,000 73,500 77,500 80,000   48  60,000 74,000 78,000 80,000   49  60,000 74,500 78,500 80,000   50  60,000 75,500 79,000 80,000   51  60,000 76,000 80,000 80,000   52  60,000 76,500 80,000 80,000   53  60,000 77,500 80,000 80,000   54  60,000 78,000 80,000 80,000   55  60,000 78,500 80,000 80,000   56  60,000 79,500 80,000 80,000   57  60,000 80,000 80,000 80,000   ­­Notwithstanding the above table, two consecutive sets of tandem axles may carry a gross load of thirty-four thousand pounds each if the overall distance between the first and last axles of such consecutive sets of tandem axles is thirty-six feet or more.  4. Whenever the state highways and transportation commission finds that any state highway bridge in the state is in such a condition that use of such bridge by vehicles of the weights specified in subsection 3 of this section will endanger the bridge, or the users of the bridge, the commission may establish maximum weight limits and speed limits for vehicles using such bridge. The governing body of any city or county may grant authority by act or ordinance to the commission to enact the limitations established in this section on those roadways within the purview of such city or county. Notice of the weight limits and speed limits established by the commission shall be given by posting signs at a conspicuous place at each end of any such bridge.  5. Nothing in this section shall be construed as permitting lawful axle loads, tandem axle loads or gross loads in excess of those permitted under the provisions of P.L. 97-424 codified in Title 23 of the United States Code (23 U.S.C. Section 101, et al.), as amended.  6. Notwithstanding the weight limitations contained in this section, any vehicle or combination of vehicles operating on highways other than the interstate highway system may exceed single axle, tandem axle and gross weight limitations in an amount not to exceed two thousand pounds. However, total gross weight shall not exceed eighty thousand pounds, except as provided in subsections 9, 10, 12, and 13 of this section.  7. Notwithstanding any provision of this section to the contrary, the commission shall issue a single-use special permit, or upon request of the owner of the truck or equipment shall issue an annual permit, for the transporting of any crane or concrete pump truck or well-drillers' equipment. The commission shall set fees for the issuance of permits and parameters for the transport of cranes pursuant to this subsection. Notwithstanding the provisions of section 301.133, cranes, concrete pump trucks, or well-drillers' equipment may be operated on state-maintained roads and highways at any time on any day.  8. Notwithstanding the provision of this section to the contrary, the maximum gross vehicle limit and axle weight limit for any vehicle or combination of vehicles equipped with an idle reduction technology may be increased by a quantity necessary to compensate for the additional weight of the idle reduction system as provided for in 23 U.S.C. Section 127, as amended. In no case shall the additional weight increase allowed by this subsection be greater than five hundred fifty pounds. Upon request by an appropriate law enforcement officer, the vehicle operator shall provide proof that the idle reduction technology is fully functional at all times and that the gross weight increase is not used for any purpose other than for the use of idle reduction technology.  9. Notwithstanding any provision of this section or any other law to the contrary, the total gross weight of any vehicle or combination of vehicles hauling milk from a farm to a processing facility or livestock may be as much as, but shall not exceed, eighty-five thousand five hundred pounds while operating on highways other than the interstate highway system. The provisions of this subsection shall not apply to vehicles operated and operating on the Dwight D. Eisenhower System of Interstate and Defense Highways.  10. Notwithstanding any provision of this section or any other law to the contrary, any vehicle or combination of vehicles hauling grain or grain coproducts during times of harvest may be as much as, but not exceeding, ten percent over the maximum weight limitation allowable under subsection 3 of this section while operating on highways other than the interstate highway system. The provisions of this subsection shall not apply to vehicles operated and operating on the Dwight D. Eisenhower System of Interstate and Defense Highways.  11. Notwithstanding any provision of this section or any other law to the contrary, the commission shall issue emergency utility response permits for the transporting of utility wires or cables, poles, and equipment needed for repair work immediately following a disaster where utility service has been disrupted. Under exigent circumstances, verbal approval of such operation may be made either by the department of transportation motor carrier compliance supervisor or other designated motor carrier services representative. Utility vehicles and equipment used to assist utility companies granted special permits under this subsection may be operated and transported on state-maintained roads and highways at any time on any day. The commission shall promulgate all necessary rules and regulations for the administration of this section. Any rule or portion of a rule, as that term is defined in section 536.010, that is created under the authority delegated in this section shall become effective only if it complies with and is subject to all of the provisions of chapter 536 and, if applicable, section 536.028. This section and chapter 536 are nonseverable and if any of the powers vested with the general assembly pursuant to chapter 536 to review, to delay the effective date, or to disapprove and annul a rule are subsequently held unconstitutional, then the grant of rulemaking authority and any rule proposed or adopted after August 28, 2014, shall be invalid and void.  12. Notwithstanding any provision of this section to the contrary, emergency vehicles designed to be used under emergency conditions to transport personnel and equipment and to support the suppression of fires and mitigate hazardous situations may have a maximum gross vehicle weight of eighty-six thousand pounds inclusive of twenty-four thousand pounds on a single steering axle; thirty-three thousand five hundred pounds on a single drive axle; sixty-two thousand pounds on a tandem axle; or fifty-two thousand pounds on a tandem rear-drive steer axle; except that, such emergency vehicles shall only operate on the Dwight D. Eisenhower National System of Interstate and Defense Highways.  13. Notwithstanding any provision of this section to the contrary, a vehicle operated by an engine fueled primarily by natural gas may operate upon the public highways of this state in excess of the vehicle weight limits set forth in this section by an amount that is equal to the difference between the weight of the vehicle attributable to the natural gas tank and fueling system carried by that vehicle and the weight of a comparable diesel tank and fueling system. In no event shall the maximum gross vehicle weight of the vehicle operating with a natural gas engine exceed eighty-two thousand pounds. ­­-------- (RSMo 1939 § 8406, A.L. 1943 p. 663, A. 1949 S.B. 1113, A.L. 1951 p. 695, A.L. 1957 p. 624, A.L. 1963 p. 417, A.L. 1965 p. 489, A.L. 1967 p. 412, A.L. 1983 H.B. 539, A.L. 1985 H.B. 157 merged with H.B. 330, A.L. 2000 H.B. 1948, A.L. 2001 S.B. 244, A.L. 2008 S.B. 930 & 947, A.L. 2012 S.B. 470 merged with S.B. 568 merged with S.B. 631, A.L. 2013 H.B. 103, A.L. 2014 H.B. 1190, A.L. 2015 S.B. 12, A.L. 2017 S.B. 8 merged with S.B. 222 merged with S.B. 225, A.L. 2018 S.B. 683 merged with S.B. 881, A.L. 2020 H.B. 1963)  Prior revision: 1929 § 7787  (1971) The single axle, tandem axle and gross weight limits specified in § 304.180 are cumulative and each must be complied with. The state is not required to establish either intent to violate the limits or guilty knowledge of such violation to make a case. State v. Boze (A.), 472 S.W.2d 35.