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Alabama Code (Last Updated: November 28, 2014) |
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Title32 MOTOR VEHICLES AND TRAFFIC. |
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Chapter9. TRUCKS, TRAILERS AND SEMITRAILERS. |
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Article2. Size and Weight. |
§32-9-20. Schedule of restrictions.
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(a) It shall be unlawful for any person to drive or move on any highway in this state any vehicle or vehicles of a size or weight except in accordance with the following:
(1) WIDTH. Vehicles and combinations of vehicles, operating on highways with traffic lanes 12 feet or more in width, shall not exceed a total outside width, including any load thereon, of 102 inches, exclusive of mirrors or other safety devices approved by the State Transportation Department. The Director of the State Transportation Department may, in his or her discretion, designate other public highways for use by vehicles and loads with total outside widths not exceeding 102 inches, otherwise; vehicles and combinations of vehicles, operating on highways with traffic lanes less than 12 feet in width, shall not exceed a total outside width, including any load thereon, of 96 inches, exclusive of mirrors or other safety devices approved by the State Transportation Department. No passenger vehicle shall carry any load extending beyond the line of the fenders. No vehicle hauling forest products or culvert pipe on any highway in this state shall have a load exceeding 102 inches in width.
(2) HEIGHT. No vehicle or semitrailer or trailer shall exceed in height 13 1/2 feet, including load.
(3) LENGTH. No vehicle shall exceed in length 40 feet; except, that the length of a truck-semitrailer combination, semitrailers, including load, used in a truck tractor-semitrailer combination, shall not exceed 57 feet; semitrailers and trailers, including load, used in a truck tractor-semitrailer-trailer combination, shall not exceed 28 1/2 feet each; and motor vehicles designed, used, or maintained primarily as a mobile dwelling, office, or commercial space, commonly called motor homes, shall not exceed 45 feet. Semitrailers exceeding 53 1/2 feet shall only be operated on highways designated pursuant to Section 32-9-1 and shall only be operated when the distance between the kingpin of the semitrailer and the rearmost axle or a point midway between the two rear axles, if the two rear axles are tandem axles, does not exceed 41 feet and if the semitrailer is equipped with a rear underride guard of a substantial construction consisting of a continuous lateral beam extending to within four inches of the lateral extremities of the semitrailer and located not more than 22 inches from the surface as measured with the semitrailers empty and on a level surface. For purposes of enforcement of this subdivision, lengths of semitrailers and trailers refer to the cargo carrying portion of the unit. Truck tractor units used exclusively in combinations transporting motor vehicles may directly carry a portion of the cargo, provided that the combinations are restricted to truck tractor-semitrailer combinations only and provided further that the overall length of these particular combinations shall not exceed 65 feet; except that the overall length of stinger-steered type units shall not exceed 75 feet. No truck tractor-semitrailer combination used exclusively for transporting motor vehicles shall carry any load extending more than three feet beyond the front or four feet beyond the rear of the combination. No other vehicle operated on a highway shall carry any load extending more than a total of five feet beyond both the front and rear, inclusive, of the vehicle.
(4) WEIGHT.
a. The gross weight imposed on the highway by the wheels of any one axle of a vehicle shall not exceed 20,000 pounds, or such other weight, if any, as may be permitted by federal law to keep the state from losing federal funds; provided, that inadequate bridges shall be posted to define load limits.
b. For the purpose of this section, an axle load shall be defined as the total load transmitted to the road by all wheels whose centers are included between two parallel transverse vertical planes 40 inches apart, extending across the full width of the vehicle.
c. Subject to the limit upon the weight imposed upon the highway through any one axle as set forth herein, the total weight with load imposed upon the highway by all the axles of a vehicle or combination of vehicles shall not exceed the gross weight given for the respective distances between the first and last axle of the vehicle or combination of vehicles, measured longitudinally to the nearest foot as set forth in the following table:
COMPUTED GROSS WEIGHT TABLE For various spacings of axle groupings
Distance in feet between first and last axles of vehicle or combination of vehicles Maximum load in pounds on all the axles
2 axles 3 axles 4 axles 5 axles 6 axles 8 or less 36,000 42,000 42,000 9 38,000 42,500 42,500 10 40,000 43,500 43,500 11 44,000 44,000 12 45,000 50,000 50,000 13 45,500 50,500 50,500 14 46,500 51,500 51,500 15 47,000 52,000 52,000 16 48,000 52,500 58,000 58,000 17 48,500 53,500 58,500 58,500 18 49,500 54,000 59,000 59,000 19 50,000 54,500 60,000 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 25 54,500 58,500 63,500 69,000 26 56,000 59,500 64,000 69,500 27 57,000 60,000 65,000 70,000 28 59,000 60,500 65,500 71,000 29 60,000 61,500 66,000 71,500 30 62,000 66,500 72,000 31 63,500 67,000 72,500 32 64,500 68,000 73,500 33 65,000 69,000 74,000 34 65,500 70,000 74,500 35 66,500 71,000 75,000 36 67,000 72,000 76,000 37 68,000 73,000 77,000 38 69,000 74,000 78,000 39 70,000 75,000 79,000 40 71,000 76,000 80,000 41 72,000 77,000 81,000 42 73,000 78,000 82,000 43 74,000 79,000 83,000 44 and over 75,000 80,000 84,000
Except as provided by special permits, no vehicle or combination of vehicles exceeding the gross weights specified above shall be permitted to travel on the public highways within the State of Alabama.
No vehicle or combination of vehicles shall be permitted to operate on any portion of the Interstate Highway System of Alabama that shall have a greater weight than 20,000 pounds carried on any one axle, including all enforcement tolerances, or with a tandem axle weight in excess of 34,000 pounds, including all enforcement tolerances, or with an overall gross weight on a group of two or more consecutive axles produced by application of the following formula:
W=500 LN + 12N + 36 N-1
- where W = overall gross weight on any group of two or more consecutive axles to the nearest 500 pounds, L = distance in feet between the extreme of any group of two or more consecutive axles, and N = number of axles in group under consideration; except, that two consecutive sets of tandem axles may carry a gross load of 34,000 pounds each, provided the overall distance between the first and last axles of the consecutive sets of tandem axles is 36 feet or more; provided, that the overall gross weight may not exceed 80,000 pounds, including all enforcement tolerances. Nothing in this section shall be construed as permitting size or weight limits on the National System of Interstate and Defense Highways in this state in excess of those permitted under 23 U.S.C. Section 127. If the federal government prescribes or adopts vehicle size or weight limits greater than or less than those now prescribed by 23 U.S.C. Section 127 for the National System of Interstate and Defense Highways, the increased or decreased limits shall become effective on the National System of Interstate and Defense Highways in this state. Nothing in this section shall be construed to deny the operation of any vehicle or combination of vehicles that could be lawfully operated upon the highways and roads of this state on January 4, 1975.
d. For purposes of enforcement of this subdivision, all weights less than or equal to the sum of the weight otherwise prescribed by this subdivision, plus an additional weight to be calculated by multiplying the weight prescribed by this subdivision by one-tenth (.10) that shall represent a scale or enforcement tolerance, shall be deemed to be in compliance with the requirements of this section, and shall not constitute violations thereof. No evidence shall be admitted into evidence or considered by the trier of fact in any civil action unless the evidence proffered would tend to prove that the weight of the vehicle exceeded the amount provided in this subsection. Nothing in this paragraph d. shall restrict or affect the right of any defendant to place in evidence such evidence tending to prove the defendant was in compliance with this section.
e. Dump trucks, dump trailers, concrete mixing trucks, fuel oil, gasoline trucks, and trucks designated and constructed for special type work or use shall not be made to conform to the axle spacing requirements of paragraph (4)c of this section; provided, that the vehicle shall be limited to a weight of 20,000 pounds per axle plus scale tolerances; and, provided further, that the maximum gross weight of the vehicles shall not exceed the maximum weight allowed by this section for the appropriate number of axles, irrespective of the distance between axles, plus allowable scale tolerances. All axles shall be brake equipped. Concrete mixing trucks which operate within 50 miles of their home base shall not be required to conform to the requirements of paragraph (4)a of this section; provided, that the vehicles shall be limited to a maximum load of the rated capacity of the concrete mixer, the true gross load not to exceed 66,000 pounds, and all the vehicles shall have at least three axles, each with brake equipped wheels. It shall be a violation if the vehicles named under this subdivision travel upon bridges designated and posted by the Transportation Director as incapable of carrying the load.
f. If the driver of any vehicle can comply with the weight requirements of this section by shifting or equalizing the load on all wheels or axles and does so when requested by the proper authority, the driver shall not be held to be operating in violation of this section.
g. When portable scales are used in the enforcement of this section, the axles of any vehicle described or commonly referred to as tandem or triaxle rigs or units (that is, vehicles having two or more axles in addition to a steering axle), the group of tandem or triaxles shall be weighed simultaneously, and the total weight so derived shall be divided by the number of axles weighed in the group to arrive at the per axle weight, except that if any one axle in the group exceeds 20,000 pounds in weight, it shall not exceed the weight of any other axle in the group by more than 50 percent. When portable scales are used to determine the weight of a vehicle pursuant to this section, the operator of the vehicle will be permitted to move the vehicle to the nearest platform scales certified by the Department of Agriculture and Industries and operated by a bonded operator within a distance of 10 highway miles, accompanied by an enforcement officer to verify the accuracy of the portable scales used in determining the vehicle weight. If the weight of the vehicle is shown by the platform scales to be within the legal limits of this section, the operator of the vehicle shall not be held to be in violation of this section.
h. The governing body of a county, by appropriate resolution, may authorize limitations less than those prescribed herein for vehicles operated upon the county highways of the county.
i. The State Transportation Department may post or limit any road or bridge to weights less than those prescribed by this section. It is the legislative intent and purpose that this section be rigidly enforced by the State Transportation Department, the Department of Public Safety and any other authorized law enforcement officers of the state, any county, or city and incorporated towns.
j. Two and three axle vehicles being used exclusively for the purpose of transporting agricultural commodities or products to and from a farm and for agricultural purposes relating to the operation and maintenance of a farm by any farmer, custom harvester or husbandman may not be made to conform to the axle requirements of paragraph (4)a of this section or the gross weight requirements of paragraph (4)c of this section.
(b)(1) Any vehicle utilizing an auxiliary power or idle reduction technology unit in order to promote reduction of fuel use and emissions because of engine idling shall be allowed an additional 400 pounds total to the gross, axle, tandem, or bridge formula weight limits defined in this section.
(2) To be eligible for the exception provided in this subsection, the operator of the vehicle must provide written proof or certification of the weight of the auxiliary power unit (APU) and demonstrate or certify the idle reduction technology is fully functional at all times.
(3) Written proof or certification of the weight of the APU must be available to law enforcement officers if the vehicle is found in violation of applicable weight laws. The weight allowed cannot exceed 400 pounds or the actual weight proven or certified, whichever is less.
(4) It is the intent of this subsection to apply at the state highway level the weight limit increase for vehicles using a functioning auxiliary power or idle reduction technology as provided in the Federal Energy Policy Act of 2005.