(625 ILCS 5/15-111)
(from Ch. 95 1/2, par. 15-111)
Wheel and axle loads and gross weights.
(a) No vehicle or combination of vehicles
with pneumatic tires may be operated, unladen or with load,
when the total weight on the road surface
exceeds the following: 20,000 pounds on a single axle; 34,000 pounds on a tandem axle with
no axle within the tandem exceeding 20,000 pounds; 80,000
pounds gross weight for vehicle combinations of 5 or more axles;
or a total weight on a group of 2 or more consecutive axles in excess of that
weight produced by the application of the following formula: W = 500 times the
sum of (LN divided by N-1) + 12N + 36, where "W" equals overall total weight on
any group of 2 or more consecutive axles to the nearest 500 pounds, "L" equals
distance measured to the nearest foot between extremes of any group of 2 or
more consecutive axles, and "N" equals the number of axles in the group under
The above formula when expressed in tabular form results in allowable loads
to the nearest
foot between the
extremes of any Maximum weight in pounds
group of 2 or of any group of
more consecutive 2 or more consecutive axles
*If the distance between 2 axles is 96 inches or less, the 2 axles are
tandem axles and the maximum total weight may not exceed 34,000 pounds,
notwithstanding the higher limit resulting from the application of the formula.
Vehicles not in a combination having more than 4 axles may not exceed the
weight in the table in this subsection (a) for 4 axles measured between the
extreme axles of the
Vehicles in a combination having more than 6 axles may not exceed the weight
in the table in this subsection (a) for 6 axles measured between the extreme
axles of the
Local authorities, with respect
to streets and highways under their jurisdiction, without additional
fees, may also by ordinance or resolution allow the weight limitations of this
subsection, provided the maximum gross weight on any one axle shall not exceed
20,000 pounds and the maximum total weight on any tandem axle
shall not exceed
34,000 pounds, on designated highways when appropriate regulatory signs giving
notice are erected upon the street or highway or portion of any street or
highway affected by the ordinance or resolution.
The following are exceptions to the above formula:
(1) Vehicles for which a different limit is
established and posted in accordance with Section 15-316 of this Code.
(2) Vehicles for which the Department of
Transportation and local authorities issue overweight permits under authority of Section 15-301 of this Code. These vehicles are not subject to the bridge formula.
(3) Cities having a population of more than 50,000
may permit by ordinance axle loads on 2 axle motor vehicles 33 1/2% above those provided for herein, but the increase shall not become effective until the city has officially notified the Department of the passage of the ordinance and shall not apply to those vehicles when outside of the limits of the city, nor shall the gross weight of any 2 axle motor vehicle operating over any street of the city exceed 40,000 pounds.
(4) Weight limitations shall not apply to vehicles
(including loads) operated by a public utility when transporting equipment required for emergency repair of public utility facilities or properties or water wells.
(5) Two consecutive sets of tandem axles may carry a
total weight of 34,000 pounds each if the overall distance between the first and last axles of the consecutive sets of tandem axles is 36 feet or more, notwithstanding the lower limit resulting from the application of the above formula.
(6) A truck, not in combination and used exclusively
for the collection of rendering materials, may, when laden, transmit upon the road surface, except when on part of the National System of Interstate and Defense Highways, the following maximum weights: 22,000 pounds on a single axle; 40,000 pounds on a tandem axle.
(7) A truck not in combination, equipped with a self
compactor or an industrial roll-off hoist and roll-off container, used exclusively for garbage, refuse, or recycling operations, may, when laden, transmit upon the road surface, except when on part of the National System of Interstate and Defense Highways, the following maximum weights: 22,000 pounds on a single axle; 40,000 pounds on a tandem axle; 40,000 pounds gross weight on a 2-axle vehicle; 54,000 pounds gross weight on a 3-axle vehicle. This vehicle is not subject to the bridge formula.
(8) Tandem axles on a 3-axle truck registered as a
Special Hauling Vehicle, manufactured prior to or in the model year of 2014 and first registered in Illinois prior to January 1, 2015, with a distance greater than 72 inches but not more than 96 inches between any series of 2 axles, is allowed a combined weight on the series not to exceed 36,000 pounds and neither axle of the series may exceed 20,000 pounds. Any vehicle of this type manufactured after the model year of 2014 or first registered in Illinois after December 31, 2014 may not exceed a combined weight of 34,000 pounds through the series of 2 axles and neither axle of the series may exceed 20,000 pounds.
(9) A 4-axle truck mixer registered as a Special
Hauling Vehicle, used exclusively for the mixing and transportation of concrete in the plastic state, manufactured before or in the model year of 2014, first registered in Illinois before January 1, 2015, and not operated on a highway that is part of the National System of Interstate Highways, is allowed the following maximum weights: 20,000 pounds on any single axle; 36,000 pounds on a series of axles greater than 72 inches but not more than 96 inches; and 34,000 pounds on any series of 2 axles greater than 40 inches but not more than 72 inches. The gross weight of this vehicle may not exceed the weights allowed by the bridge formula for 4 axles. The bridge formula does not apply to any series of 3 axles while the vehicle is transporting concrete in the plastic state, but no axle or tandem axle of the series may exceed the maximum weight permitted under this paragraph (9) of subsection (a).
(10) Combinations of vehicles, registered as Special
Hauling Vehicles that include a semitrailer manufactured prior to or in the model year of 2014, and registered in Illinois prior to January 1, 2015, having 5 axles with a distance of 42 feet or less between extreme axles, may not exceed the following maximum weights: 20,000 pounds on a single axle; 34,000 pounds on a tandem axle; and 72,000 pounds gross weight. This combination of vehicles is not subject to the bridge formula. For all those combinations of vehicles that include a semitrailer manufactured after the effective date of P.A. 92-0417, the overall distance between the first and last axles of the 2 sets of tandems must be 18 feet 6 inches or more. Any combination of vehicles that has had its cargo container replaced in its entirety after December 31, 2014 may not exceed the weights allowed by the bridge formula.
(11) The maximum weight allowed on a vehicle with
crawler type tracks is 40,000 pounds.
(12) A combination of vehicles, including a tow truck
and a disabled vehicle or disabled combination of vehicles, that exceeds the weight restriction imposed by this Code, may be operated on a public highway in this State provided that neither the disabled vehicle nor any vehicle being towed nor the tow truck itself shall exceed the weight limitations permitted under this Chapter. During the towing operation, neither the tow truck nor the vehicle combination shall exceed 24,000 pounds on a single rear axle and 44,000 pounds on a tandem rear axle, provided the towing vehicle:
(i) is specifically designed as a tow truck
having a gross vehicle weight rating of at least 18,000 pounds and is equipped with air brakes, provided that air brakes are required only if the towing vehicle is towing a vehicle, semitrailer, or tractor-trailer combination that is equipped with air brakes;
(ii) is equipped with flashing, rotating, or
oscillating amber lights, visible for at least 500 feet in all directions;
(iii) is capable of utilizing the lighting and
braking systems of the disabled vehicle or combination of vehicles; and
(iv) does not engage in a tow exceeding 20 miles
from the initial point of wreck or disablement. Any additional movement of the vehicles may occur only upon issuance of authorization for that movement under the provisions of Sections 15-301 through 15-319 of this Code. The towing vehicle, however, may tow any disabled vehicle to a point where repairs are actually to occur. This movement shall be valid only on State routes. The tower must abide by posted bridge weight limits.
Gross weight limits shall not apply to the combination of the tow truck
and vehicles being towed. The tow truck license plate must cover the
operating empty weight of the tow truck only. The weight
of each vehicle being towed shall be covered by a valid license plate issued to
the owner or operator of the vehicle being towed and displayed on that vehicle.
If no valid plate issued to the owner or operator of that vehicle is displayed
on that vehicle, or the plate displayed on that vehicle does not cover the
weight of the vehicle, the weight of the vehicle shall be covered by
the third tow truck plate issued to the owner or operator of the tow truck and
temporarily affixed to the vehicle being towed. If a roll-back carrier is registered and being used as a tow truck, however, the license plate or plates for the tow truck must cover the gross vehicle weight, including any load carried on the bed of the roll-back carrier.
The Department may by rule or regulation prescribe additional requirements.
However, nothing in this Code shall prohibit a tow truck under
instructions of a police officer from legally clearing a disabled vehicle,
that may be in violation of weight limitations of this Chapter, from the
roadway to the berm or shoulder of the highway.
If in the opinion of the police officer that location is unsafe, the officer
is authorized to have the disabled vehicle towed to the nearest place of
For the purpose of this subsection, gross vehicle weight rating, or
GVWR, means the value specified by the manufacturer as the loaded
weight of the tow truck.
(b) As used in this Section, "recycling haul" or "recycling operation" means the hauling of non-hazardous, non-special, non-putrescible materials, such as paper, glass, cans, or plastic, for subsequent use in the secondary materials market.
(c) No vehicle or combination of vehicles equipped with pneumatic tires
shall be operated, unladen or with load, upon the highways of this State in
violation of the provisions of any permit issued under the provisions of
Sections 15-301 through 15-319 of this Chapter.
(d) No vehicle or combination of vehicles equipped with other than pneumatic
tires may be operated, unladen or with load, upon the highways of this State
when the gross weight on the road surface through any wheel exceeds 800
pounds per inch width of tire tread or when the gross weight on the road
surface through any axle exceeds 16,000 pounds.
(e) No person shall operate a vehicle or combination of vehicles over
a bridge or other elevated structure constituting part of a highway with a
gross weight that is greater than the maximum weight permitted by the
Department, when the structure is sign posted as provided in this Section.
(f) The Department upon request from any local authority shall, or upon
its own initiative may, conduct an investigation of any bridge or other
elevated structure constituting a part of a highway, and if it finds that
the structure cannot with safety to itself withstand the weight of vehicles
otherwise permissible under this Code the Department shall determine and
declare the maximum weight of vehicles that the structures can withstand,
and shall cause or permit suitable signs stating maximum weight to be
erected and maintained before each end of the structure. No person shall
operate a vehicle or combination of vehicles over any structure with a
gross weight that is greater than the posted maximum weight.
(g) Upon the trial of any person charged with a violation of subsection
(e) or (f) of this Section, proof of the determination of the maximum
allowable weight by the Department and the existence of the signs,
constitutes conclusive evidence of the maximum weight that can be
maintained with safety to the bridge or structure.
(Source: P.A. 96-34, eff. 1-1-10; 96-37, eff. 7-13-09; 97-201, eff. 1-1-12.)