Signal Warrant Studies, New Signals

Traffic signals always decrease congestion and delay for some vehicles, and always increase delay and congestion for other vehicles. By definition, a green light for some traffic is a red light for other traffic. Signals typically reduce certain types of accidents and increase other types of accidents. Prior to the installation of a traffic signal in Scottsdale, a thorough study is completed that analyzes the anticipated advantages and disadvantages of the proposed signal.

The procedure utilized was developed by the Federal Highway Administration. It consists of eight separate, but related warrants (sets of criteria). The primary consideration is the traffic volumes on each of the approaches to the intersection. An equally important factor is the accident history at the intersection. The proximity of other traffic signals is also considered. The presence of pedestrians, schools, hospitals, and other similar considerations are also analyzed.

Questions contact Traffic Engineering staff at 480-312-7250