There are not enough cameras in Wilmington to get an accurate idea of whether or not they are effective. First of all, the delayed green is far more important than the camera. Holding traffic a couple seconds after a light turns red before the green appears, gives those trying to beat the red time to clear the intersection before any cross traffic enters. If someone is texting or otherwise not paying attention to the light, accidents are going to happen regardless of the camera. For the most part, the cameras are just quick money-makers which most likely do cause many rear-end collisions.
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