traffic cameras
![](https://cdn.abcotvs.com/dip/images/15009547_062824-wls-garcia-speed-cameras-5p-vid.jpg?w=660&r=16%3A9)
IL expressway signs warn of speed cameras, which are not in commission
Photo-enforced speed cameras have been out of commission in Illinois, despite signs that warn about them. According to a study by IDOT and the University of Illinois, just having the signs up makes a big difference.
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