625 ILCS 5/11-315
For the purposes of this Section, "paved bicycle trail" includes trails accommodating bicycle traffic composed of aggregate, asphalt, bituminous treatment, concrete, crushed limestone, or any combination thereof. The authority having maintenance jurisdiction over publicly owned paved bicycle trails in the State shall erect permanent regulatory or warning signage alerting pedestrians or cyclists of highway crossings. If the authority having maintenance jurisdiction over publicly owned bicycle trails has actual knowledge of an emergency or safety hazard that creates a dangerous condition on a publicly owned paved bicycle trail, the authority shall take reasonable steps to erect temporary signage alerting pedestrians or cyclist of the dangerous condition. The Department with reference to State highways under its jurisdiction, and the local authority with reference to other highways under its jurisdiction, shall erect or install permanent signage or markings warning vehicular traffic in advance of bicycle trail crossings. Permanent signage erected or installed as part of this Section shall conform with the State manual and permanent advanced warning signage shall be located at least 150 feet in advance of the crossing. This Section shall not apply to rustic or primitive trails.
625 ILCS 5/11-315