Drivers in Chicago have gotten wise to speed cameras, budget figures show, and now the city needs to come up with $50 million in revenue. Chicagoans are costing the city tens of millions of dollars -– through good behavior. Mayor Rahm Emanuel underestimated the intelligence of Chicago drivers, and the city paid for it big time. On a smooth, wide, well-travelled stretch of Irving Park Road, running between two cemeteries — no homes, no stores, no parking — the city of Chicago is trying to balance its budget. Each flash means a photo; each photo, a violation. Each violation: a hundred bucks, from red-light and speed cameras. CBS 2 has learned the speed cameras caught far fewer speeders than expected. According to the Mayor’s 2015 Budget Overview, there have been “lower than expected violation rates.â€