The Glencoe Public Safety Department said they responded at about 4:15 p.m. to the area of Sheridan Road and South Avenue after a 64-year-old man riding a bicycle when he struck the back of a Dodge Ram ProMaster.
The injured bicyclist was transported to a hospital in Evanston in critical condition, authorities said. The driver of the Dodge Ram ProMaster remained on the scene.
The North Regional Major Crash Assistance Team is investigating the incident.