Learn About The Law
Get help with your legal needs
FindLaw’s Learn About the Law features thousands of informational articles to help you understand your options. And if you’re ready to hire an attorney, find one in your area who can help.
Current as of January 01, 2024 | Updated by Findlaw Staff
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 8 1/2 feet.
(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 9 feet.
(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 14 feet.
(3) The length of a vehicle, or vehicle combination, except as noted below shall not exceed:
(a) When a single motor vehicle 45 feet.
(b) When a trailer or semitrailer, except as noted in this subsection 48 feet.
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 65 feet.
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 53 feet.
(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 75 feet.
(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 61 feet.
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 75 feet.
(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 68 feet.
(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) 75 feet.
(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 75 feet.
(h) When a dromedary tractor with semitrailer, not meeting the stinger-steer requirement as defined in paragraph (f) of this subsection 65 feet.
(i) When a boat transporter, stinger-steered as defined in subsection (3)(f) of this section, excluding front and rear overhang of load 75 feet.
(j) When an auto transporter, stinger-steered as defined in subsection (3)(f) of this section, excluding front and rear overhang of load 80 feet.
(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 65 feet.
(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 75 feet.
(4) The overhang or extension of a load shall not extend:
(a) Beyond the front of a vehicle, more than 4 feet.
(b) Beyond the end of a vehicle, more than 10 feet.
(c) Beyond the left fender of a passenger vehicle, more than 0 feet.
(d) Beyond the right fender of a passenger vehicle, more than 6 inches.
(e) To the front of a boat transporter, more than 3 feet.
(f) To the rear of a boat transporter, more than 4 feet.
(g) To the front of an auto transporter, more than 4 feet.
(h) To the rear of an auto transporter, more than 6 feet.
(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 97 feet.
(b) Other than the national network 75 feet.
(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 95 feet.
(b) Truck tractor and three (3) trailing units 95 feet.
(c) Truck and two (2) trailing units 98 feet.
Cite this article: FindLaw.com - Idaho Statutes Title 49. Motor Vehicles § 49-1010. Size of vehicles and loads - last updated January 01, 2024 | https://codes.findlaw.com/id/title-49-motor-vehicles/id-st-sect-49-1010/
FindLaw Codes may not reflect the most recent version of the law in your jurisdiction. Please verify the status of the code you are researching with the state legislature before relying on it for your legal needs.
A free source of state and federal court opinions, state laws, and the United States Code. For more information about the legal concepts addressed by these cases and statutes, visit FindLaw’s Learn About the Law.
Get help with your legal needs
FindLaw’s Learn About the Law features thousands of informational articles to help you understand your options. And if you’re ready to hire an attorney, find one in your area who can help.
Search our directory by legal issue
Enter information in one or both fields (Required)