WHEAT RIDGE, Colo. It’s been more than a year since Wheat Ridge expanded its use of automated traffic enforcement, and police say speed cameras have already started changing driver behavior. There’s a dramatic reduction in excessive speed over time, said Alex Rose, Wheat Ridge Police Department public information officer. The camera outside Wheat Ridge High School has led to a 75% reduction in citations since it was installed. Two of the four cameras Wheat Ridge has are permanent, and two are mobile trailers police can move to areas with speeding concerns.