2023 Idaho Code › Title 49 - MOTOR VEHICLES › Chapter 10 - WEIGHT, SPEED AND TIRE REGULATIONS › Section 49-1010 - SIZE OF VEHICLES AND LOADS.

49-1010. SIZE OF VEHICLES AND LOADS. No vehicle shall exceed the dimensions specified below, except that certain devices determined by the board as necessary for the safe and efficient operation of motor vehicles, including energy conservation devices, shall be excluded from the calculation of width or length.
(1) The width of a vehicle, including any load thereon, except as noted below, shall not exceed
(a) The limitations as to size of vehicles stated in this section shall not apply to farm tractors or to implements of husbandry, including any load thereon, or any trailer not wider than the implement of husbandry used in the transportation of implements of husbandry for agricultural operations, and including all equipment used in land leveling operations, when being incidentally operated upon the highway from one farm operation to another during daylight hours.
(b) The limitations as to size of vehicles shall not apply to farmers or their designated agents, or equipment dealers transporting implements of husbandry and equipment listed in paragraph (a) of this subsection for the purpose of:
(i) The repair or maintenance of such implements of husbandry and equipment when traveling to or from a farm to a repair or maintenance facility during daylight hours; or
(ii) The purchase, sale, lease or rental of such implements of husbandry and equipment when traveling to or from a farm to a dealership, auction house or other facility during daylight hours.
(c) Notwithstanding the exemption from width limitation for farm tractors included in paragraph (a) of this subsection, the total outside width of any farm tractor being transported on the interstate system in this state, except as permitted by section 49-1004
, Idaho Code, shall not exceed
(d) A farm tractor or implement of husbandry, when being incidentally transported upon the highway with a width in excess of the limits of paragraphs (a) and (c) of this subsection, must display one (1) red or fluorescent orange flag a minimum of eighteen (18) by eighteen (18) inches on the outermost left projection of the tractor or implement being transported.
(2) The height of a vehicle, including the load thereon, shall not exceed
(3) The length of a vehicle, or vehicle combination, except as noted below shall not exceed:
(a) When a single motor vehicle
(b) When a trailer or semitrailer, except as noted in this subsection
1. Semitrailers operating on routes determined by the board to have severe curvature, deficient width and/or heavy traffic conditions shall be limited to an overall combination length not to exceed
2. The length of a trailer tongue, or the length of the tongue of a converter gear used to convert a semitrailer to a trailer, shall be excluded from the calculation of a trailer length.
3. Semitrailers operating on routes which are a part of the national network as set forth in 23 CFR 658, on routes providing access between the national network and terminals and facilities for food, fuel, repairs and rest which are located within one (1) road mile of the national network and state highways as set forth by policy and approved by the transportation board, shall not exceed a length of
(c) When a motor vehicle and one (1) or more trailers, except as noted in subsection (3)(b), (3)(d) and (3)(e) of this section
(d) When a combination of semitrailer and trailer, or of two (2) semitrailers the length in such combination, including the connecting tongue and excluding the truck tractor except as noted in this subsection
When the combination of semitrailer and trailer or of two (2) semitrailers including the connecting tongues exceeds sixty-one (61) feet, the length of such combination including the truck tractor
(e) When a combination of a semitrailer and trailer, or of two (2) semitrailers operating on routes on the national network as set forth in 23 CFR 658 and on routes providing access between the national network and terminals and facilities for food, fuel, repairs and rest which are located within one (1) road mile of the national network, the length, including the connecting tongue and excluding the truck tractor, shall not exceed
(f) When a dromedary tractor with semitrailer, stinger-steered by having the kingpin located five (5) feet to the rear of the centroid of the rear axle(s)
(g) When a dromedary combination transporting class 1 explosive materials and/or any munitions-related security material as specified by the U.S. department of defense in compliance with 49 CFR 177.835, not meeting the stinger-steer requirement as defined in subsection (3)(f) of this section, up to
(h) When a dromedary tractor with semitrailer, not meeting the stinger-steer requirement as defined in paragraph (f) of this subsection
(i) When a boat transporter, stinger-steered as defined in subsection (3)(f) of this section, excluding front and rear overhang of load
(j) When an auto transporter, stinger-steered as defined in subsection (3)(f) of this section, excluding front and rear overhang of load
.
(k) When an auto transporter or boat transporter, not meeting the stinger-steer requirement as defined in paragraph (f) of this subsection, excluding front and rear overhang of load
(l) When a truck tractor with stinger-steered pole trailer or log dolly, connected by a reach or pole, or a combination used for transporting long loads such as poles, pipes, logs or structural members generally capable of sustaining themselves as beams between supporting bunks or connections
(4) The overhang or extension of a load shall not extend:
(a) Beyond the front of a vehicle, more than
(b) Beyond the end of a vehicle, more than
(c) Beyond the left fender of a passenger vehicle, more than
(d) Beyond the right fender of a passenger vehicle, more than
.
(e) To the front of a boat transporter, more than
(f) To the rear of a boat transporter, more than
(g) To the front of an auto transporter, more than
(h) To the rear of an auto transporter, more than
(5) Noncargo-carrying devices necessary for the safe and efficient operation of the vehicle, as determined by the board, shall not be included in measurement for length.
(6) No combination shall include more than three (3) units except when a saddlemount combination and the overall length allowed is:
(a) On the national network
(b) Other than the national network
(7) Vehicle combinations consisting of not more than four (4) vehicle units with an overall length in excess of the limits of subsection (3) of this section and with an overall combination length not to exceed one hundred fifteen (115) feet, may be operated by permit on routes designated for such operations by the public highway agency having jurisdiction over that highway system, subject to the following restrictions as to lengths of cargo-carrying units:
(a) Truck tractor and two (2) trailing units
(b) Truck tractor and three (3) trailing units
(c) Truck and two (2) trailing units
History:
[49-1010, added 1988, ch. 265, sec. 281, p. 721; am. 1989, ch. 310, sec. 24, p. 797; am. 1989, ch. 408, sec. 3, p. 999; am. 1992, ch. 230, sec. 1, p. 687; am. 1992, ch. 231, sec. 1, p. 689; am. 1992, ch. 232, sec. 3, p. 695; am. 1993, ch. 123, sec. 1, p. 313; am. 1993, ch. 334, sec. 4, p. 1242; am. 1995, ch. 72, sec. 2, p. 190; am. 2000, ch. 101, sec. 2, p. 223; am. 2000, ch. 253, sec. 1, p. 718; am. 2003, ch. 52, sec. 1, p. 191; am. 2003, ch. 239, sec. 1, p. 617; am. 2005, ch. 85, sec. 1, p. 301; am. 2007, ch. 20, sec. 2, p. 31; am. 2011, ch. 328, sec. 1, p. 962; am. 2016, ch. 58, sec. 1, p. 179; am. 2017, ch. 111, sec. 2, p. 261; am. 2019, ch. 94, sec. 2, p. 339.]