What is the best approach for a State to use in selecting a new control corridor if the State chooses to implement a new wave of TACT activity in a corridor that was previously used as a control?
An appropriate control or comparison corridor is as similar as possible to the intervention corridor with respect to roadway design, crash experience, and traffic flow but is isolated from any TACT enforcement and media activity. It is best to identify more than one potential comparison corridor at the outset of the TACT Program (e.g., select six matching corridors even though only two intervention and two comparison corridors will be used). Thereafter, if an intervention is mounted in one of the previously defined comparison corridors, the unused corridors become possible comparisons if they are sufficiently isolated from the new TACT efforts.
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