Do you think these sensors really work? We are getting these installed all over our town of about 25,000. The gadgets are on top of street lights and should sense when vehicles approach and they are suppose to help traffic flow, keeping to a minimum long lines and pile ups. However, there are times, when I sit at a red light and there are no vehicles approaching from the other directions for miles and miles it seems. Does this ever happen to anyone else?? Oh, and of course it turns green right as I decide to snap the photo.