‘Night vision’ traffic signal cabinet reduces service time, costs

signal cabinet
Photo: City of Knoxville, Tennessee 

Many agencies throughout the country are faced with malfunctioning equipment inside traffic signal cabinets. The many traffic signal cabinet components, complicated wiring, and typically tight arrangement of equipment inside the cabinet lead to a challenging working environment, especially during nighttime hours with less-than-ideal lighting conditions.

The City of Knoxville, Tennessee, painted the internal traffic signal cabinets white to create a brighter contrast with the lighting source used by technicians to increase nighttime visibility. The city also installed LED strips inside the cabinet that light up once the door is opened. The internally painted cabinets not only provide better lighting conditions but also help minimize the service time during troubleshooting service calls, saving city resources.

In addition, equipment malfunctioning declined at locations equipped with an additional fan system and the white-painted cabinets. Internal temperatures fell significantly (up to 40 degrees Fahrenheit) in locations with the modified cabinets, leading to further savings for the city. 

The project received an honorable mention in the Pioneer category of the 2023 Build a Better Mousetrap national program

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