What are the boundaries of the community that votes? What if the racial demographics of that community have changed recently, in ways that affect how the vote turns out? What if some people in that community are aware of these voting patterns and explicitly bring up race when engaging in public discussion about the merits or demerits of the red-light-camera-policy, because it's important? What if they try to change the boundaries of the voting district in order to include/exclude more people who they think will vote with/against them on the red-light-camera issue, in ways that highly correlate with race?