The Chicago Tribune uncovers a disturbing and inexplicable spike in red light camera tickets around Chicago. We'll talk to investigative reporter David Kidwell, and Joseph Schofer, an engineering professor from Northwestern who often serves as an advisor on city transportation committees, to explain why thousands of drivers were ticketed for $100 violations they did not commit. Find out if you were caught in red light camera spike using the red light ticket app.

View a map of the red light cameras that had the most dramatic spikes in tickets.

--Map by Cydney Hargis