92 Ill. Adm. Code 540.80
Design of Overpass Structures
Section 540
Section 540.80 Design of
Overpass Structures
All overpass structures will be
designed for a vertical clearance, over the pavement of 17' - 3".
Horizontal clearances from the edge of roadway to piers or abutments will
comply with current design geometric standards for structures as contained in
Section 4-005 and 4-010 of the Design Manual. All overpass structures will be
designed with protective fencing to prevent objects from accidentally being
dropped on the traffic below.