While traveling through highway construction or maintenance zones:
(A) A person may not operate a motor vehicle in a construction or maintenance speed zone at a speed in excess of the posted speed limit.
(B) Nothing in this chapter prohibits the use of electronic speed-detecting devices within 500 feet of signs within a construction or maintenance speed zone indicating the zone, as defined in this section, nor shall evidence obtained by use of those devices be inadmissible in any prosecution for speeding, provided the use of the device shall apply only to the enforcement of the speed limit in the construction or maintenance speed zone.
(C) (1) As used in this section, a CONSTRUCTION OR MAINTENANCE SPEED ZONE is an area in which the Department, toll highway authority, a local agency, or the city has posted signage advising drivers that a construction or maintenance speed zone is being approached, or in which the Department, authority, local agency or the city has posted a lower speed limit with a highway construction or maintenance speed zone special speed limit sign after determining that the preexisting established speed limit through a highway construction or maintenance project is greater than is reasonable or safe with respect to the conditions expected to exist in the construction or maintenance speed zone.
(2) If it is determined that the preexisting established speed limit is safe with respect to the conditions expected to exist in the construction or maintenance speed zone, additional speed limit signs which conform to the requirements of this division shall be posted.
(3) Highway construction or maintenance speed zone special speed limit signs shall be of a design approved by the Department. The signs must give proper due warning that a construction or maintenance speed zone is being approached and must indicate the maximum speed limit in effect. The signs must also state the amount of the minimum fine for a violation.
(D) Except as provided under division (D-5) of this section, a person who violates division (B) of this section is guilty of a petty offense. Violations of this section are punishable with a minimum fine of $250 for the first violation and a minimum fine of $750 for the second or subsequent violation.
(D-5) A person committing a violation of this section is guilty of aggravated special speed limit while traveling through a highway construction or maintenance speed zone when he or she drives a motor vehicle at a speed that is:
(1) Twenty-six miles per hour or more but less than 35 miles per hour in excess of the applicable special speed limit established under this section or a similar provision of a local ordinance and is guilty of a Class B misdemeanor; or
(2) Thirty-five miles per hour or more in excess of the applicable special speed limit established under this section or a similar provision of a local ordinance and is guilty of a Class A misdemeanor.
(E) (Reserved).
(F) The Transportation Safety Highway Hire-back Fund, which was created by Public Act 92-619, shall continue to be a special fund in the State Treasury. Subject to appropriation by the general assembly and approval by the secretary, the Secretary of Transportation shall use all moneys in the Transportation Safety Highway Hire-back Fund to hire off-duty Illinois State Police Officers to monitor construction or maintenance zones.
(G) For a second or subsequent violation of division (B) of this section within two years of the date of the previous violation, the Secretary of State shall suspend the driver’s license of the violator for a period of 90 days.
(625 ILCS 5/11-605.1)
(H) Delegation of authority to set a special speed limit while traveling through highway construction or maintenance zones.
(1) A local agency may delegate its superintendent of highways the authority to set and post a reduced speed limit for a construction or maintenance zone, as defined in ILCS Ch. 625, Act 5, §11-605;
(2) If a superintendent of highways sets a reduced speed limit for a construction or maintenance zone in accordance with this section, the local agency must maintain a record that indicates:
(a) The location of the construction or maintenance zone;
(b) The reduced speed limit set and posted for the construction or maintenance zone; and
(c) The dates during which the reduced speed limit was in effect.
(625 ILCS 5/11-605.2)