Along the busy corridor of DeRenne Avenue in Savannah, Georgia, emergency service vehicles frequently had to wait with other vehicles for traffic signals to change and lanes to clear. The corridor needed an emergency vehicle preemption system to enable faster response by emergency service vehicles, but the configuration of the corridor precluded the use of standard preemption systems such as acoustic or line-of-sight systems. After investigating different solutions, traffic engineers with the city recommended a radio-based GPS system. When emergency service vehicles turn on their emergency lights, a GPS is activated and synchronizes traffic and crosswalk signals in the forward path.
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