Traffic Signal Optimization and How to Navigate Intersections
St. Johns County is highlighting how traffic signal optimization supports efficient traffic movement and how drivers can navigate intersections as part of ongoing efforts to keep the County’s transportation network operating effectively. An educational video produced by the Office of Public Affairs features the Public Works Traffic and Transportation Division and provides an inside look at signal operations.
The technology is used at signalized intersections throughout St. Johns County to support efficient traffic movement. Traffic signals use vehicle detection systems to identify when vehicles are waiting at an intersection and communicate when it is time for the signal to change, allowing the system to respond to real-time conditions and serve traffic movements more efficiently.
Detection and signal timing are among the most common reasons residents contact the County’s Traffic and Transportation Division. Each request submitted through the SJC Connect app is reviewed on a case-by-case basis and helps staff identify locations where timing adjustments, operational improvements, or future roadway projects may be considered.
At many intersections, detection zones are placed in specific locations to sense when a vehicle is present. When a vehicle enters the zone, the system registers that movement and serves it once other phases are complete. If a following vehicle does not reach the detection zone within the programmed time, the signal assumes no additional vehicles are waiting and moves to the next phase, which can make a cycle feel shorter.
Detection zones typically end before the stop bar, so vehicles that stop beyond the stop bar may not be recognized by the system.
“Traffic signal optimization allows us to improve traffic flow, enhance safety, and make the most of our existing transportation infrastructure,” said Michael Likley, Public Works project manager for the Traffic and Transportation Division.
Drivers can help signals operate as intended by pulling forward to the stop bar when approaching an intersection and remaining attentive, so their vehicle stays within the detection zone. Minimizing distractions helps ensure signals recognize waiting vehicles and continue moving traffic efficiently.
Stay informed of more St. Johns County news by subscribing to our e-newsletters and learn how we’re shaping our community’s future by advancing the SJC Strategic Plan through the Office of Public Affairs.
Share:
