625 ILCS 5/ Illinois Vehicle Code.

(625 ILCS 5/11-606) (from Ch. 95 1/2, par. 11-606)

Sec. 11-606. Minimum speed regulation. (a) No person shall drive a motor vehicle at such a slow speed as to impede or block the normal and reasonable movement of traffic except when reduced speed is necessary for safe operation of his vehicle or in compliance with law.

(b) Whenever the Department, The Illinois State Toll Highway Authority, or a local authority described in Section 11-604 of this Chapter determines, upon the basis of an engineering and traffic investigation concerning a highway or street under its jurisdiction that slow vehicle speeds along any part or zone of such highway or street consistently impede the normal and reasonable movement of traffic, the Department, the Toll Highway Authority, or local authority (as appropriate) may determine and declare by proper regulation or ordinance a minimum speed limit below which no person shall drive except when necessary for safe operation of his vehicle or in compliance with law. A limit so determined and declared becomes effective when appropriate signs giving notice of the limit are erected along such part or zone of the highway or street.

(Source: P.A. 81-840.)

(625 ILCS 5/11-608) (from Ch. 95 1/2, par. 11-608)

Sec. 11-608. Special speed limitation on elevated structures. (a) No person shall drive a vehicle over any bridge or other elevated structure constituting a part of a highway at a speed which is greater than the maximum speed which can be maintained with safety to such bridge or structure, when such structure is sign posted as provided in this Section.

(b) 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 shall thereupon find that such structure cannot with safety to itself withstand vehicles traveling at the speed otherwise permissible under this Chapter, the Department shall determine and declare the maximum speed of vehicles which such structure can safely withstand, and shall cause or permit suitable signs stating such maximum speed to be erected and maintained before each end of such structure.

(c) Upon the trial of any person charged with a violation of this Section proof of the determination of the maximum speed by the Department and the existence of such signs is conclusive evidence of the maximum speed which can be maintained with safety to such bridge or structure.

(Source: P.A. 76-1586.)

(625 ILCS 5/11-610) (from Ch. 95 1/2, par. 11-610)

Sec. 11-610. Charging violations and rule in civil actions.

(a) In every charge of violation of any speed regulation in this Article the complaint, and also the summons or notice to appear, shall specify the speed at which the defendant is alleged to have driven and the maximum speed applicable within the district or at the location.

(b) The provision of this Article declaring maximum speed limitations shall not be construed to relieve the plaintiff in any action from the burden of proving negligence on the part of the defendant as the proximate cause of a crash.

(Source: P.A. 102-982, eff. 7-1-23.)

(625 ILCS 5/11-611) (from Ch. 95 1/2, par. 11-611)

Sec. 11-611. No person shall drive or operate any motor vehicle on any street or highway in this State where the minimum allowable speed on that street or highway, as posted, is greater than the maximum attainable operating speed of the vehicle. Maximum attainable operating speed shall be determined by the manufacturer of the vehicle and clearly published in the manual of specifications and operation, or it shall be determined by applicable rule and regulation promulgated by the Secretary of State.

(Source: P.A. 79-700.)

(625 ILCS 5/11-612)

Sec. 11-612. Certain systems to record vehicle speeds prohibited. Except as authorized in the Automated Traffic Control Systems in Highway Construction or Maintenance Zones Act and Section 11-208.8 of this Code, no photographic, video, or other imaging system may be used in this State to record vehicle speeds for the purpose of enforcing any law or ordinance regarding a maximum or minimum speed limit unless a law enforcement officer is present at the scene and witnesses the event. No State or local governmental entity, including a home rule county or municipality, may use such a system in a way that is prohibited by this Section. The regulation of the use of such systems is an exclusive power and function of the State. This Section is a denial and limitation of home rule powers and functions under subsection (h) of Section 6 of Article VII of the Illinois Constitution.

(Source: P.A. 97-672, eff. 7-1-12.)

(625 ILCS 5/Ch. 11 Art. VII heading) ARTICLE VII. DRIVING ON RIGHT SIDE OF ROADWAY; OVERTAKING AND PASSING, ETC.

(625 ILCS 5/11-701) (from Ch. 95 1/2, par. 11-701)

Sec. 11-701. Drive on right side of roadway - exceptions.

(a) Upon all roadways of sufficient width a vehicle shall be driven upon the right half of the roadway, except as follows:

1. When overtaking and passing another vehicle proceeding in the same direction under the rules governing such movements;

2. When an obstruction exists making it necessary to drive to the left of the center of the roadway; provided, any person so doing shall yield the right-of-way to all vehicles traveling in the proper direction upon the unobstructed portion of the roadway within such distance as to constitute an immediate hazard;

3. Upon a roadway divided into 3 marked lanes for traffic under the rules applicable thereon;

4. Upon a roadway restricted to one way traffic;

5. Whenever there is a single track paved road on one side of the public highway and 2 vehicles meet thereon, the driver on whose right is the wider shoulder shall give the right-of-way on such pavement to the other vehicle.

(b) Upon a 2 lane roadway, providing for 2-way movement of traffic, a vehicle shall be driven in the right-hand lane available for traffic, or as close as practicable to the right hand curb or edge of the roadway, except when overtaking and passing another vehicle proceeding in the same direction or when preparing for a left turn at an intersection or into a private road or driveway.

(c) Upon any roadway having 4 or more lanes for moving traffic and providing for 2-way movement of traffic, no vehicle shall be driven to the left of the center line of the roadway, except when authorized by official traffic-control devices designating certain lanes to the left side of the center of the roadway for use by traffic not otherwise permitted to use such lanes, or except as permitted under Subsection (a) 2. However, this Subsection shall not be construed as prohibiting the crossing of the center line in making a left turn into or from an alley, private road or driveway.

(d) Upon an Interstate highway or fully access controlled freeway, a vehicle may not be driven in the left lane, except when overtaking and passing another vehicle.

(e) Subsection (d) of this Section does not apply:

(1) when no other vehicle is directly behind the vehicle in the left lane;

(2) when traffic conditions and congestion make it impractical to drive in the right lane;

(3) when snow and other inclement weather conditions make it necessary to drive in the left lane;

(4) when obstructions or hazards exist in the right lane;

(5) when a vehicle changes lanes to comply with Sections 11-907, 11-907.5, and 11-908 of this Code;

(6) when, because of highway design, a vehicle must be driven in the left lane when preparing to exit;

(7) on toll highways when necessary to use I-Pass, and on toll and other highways when driving in the left lane is required to comply with an official traffic control device; or

(8) to law enforcement vehicles, ambulances, and other emergency vehicles engaged in official duties and vehicles engaged in highway maintenance and construction operations.

(Source: P.A. 99-681, eff. 1-1-17.)