Amends the Illinois Vehicle Code. Requires the authority having maintenance jurisdiction over a publicly owned paved bicycle trail in the State to erect permanent regulatory or warning signage alerting pedestrians or cyclists of highway crossings unless the intersection where the trail crosses the highway is controlled by an official traffic control device or sign (now, the signage is required regardless of whether the intersection is controlled by an official traffic control device or sign). Provides that 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 or other warning markers, including, but not limited to, cones, barricades, or drums, alerting pedestrians or cyclist of the dangerous condition (now, only temporary signage is required). Requires permanent signage erected or installed along the highways (rather than all signage erected or installed) to warn vehicular traffic to conform with the State manual and to be located at least 150 feet in advance of the crossing. Effective immediately.