Friday, May 13, 2011

Ask City Hall: Why can’t the City time the lights to all turn green at the same time?

The Gahanna City Engineer’s office is often asked questions regarding traffic signal timing and coordination.  Here are a few facts that may help you understand this complex system.

Traffic signals in Gahanna operate on a time-of-day schedule.  The timing and sequence of each light varies throughout the day.  Many of Gahanna’s signals operate in coordination.  Signal coordination is when signals in a corridor communicate with one another to operate in a sequence providing the motorist a greater opportunity to travel through the next adjacent signal.  Coordination is usually provided in a specific direction depending on volume of traffic.  For instance, during the AM Peak hour, Hamilton Road signals will favor the southbound direction and should change on a sequence which provides a motorist traveling southbound a greater opportunity to travel through multiple green lights while exiting town.