The village of Schaumburg, Ill., installed a camera at Woodfield Mall last November to film cars that were running red lights, then used the footage to issue citations. Results were astonishing. The town issued $1 million in fines in just three months.

But drivers caught by the unforgiving enforcement -- which mainly snared those who didn't come to a full stop before turning right on red -- exploded in anger. Many vowed to stop shopping at the mall unless the camera was turned off. The village stopped monitoring right turns...