SW 10th Street Improvement Project and SW 28 Street Traffic Signal Timing
as of Monday July 1st, 2013
Following the final report received from FDOT regarding the SW 10th Street improvement, a letter was sent to FDOT requesting an explanation for the traffic light timing at the intersection of SW 28th Ave. and SW 10th St. The response is shown below for Waterford Homes residents to review and comment. At this time the traffic signal timing appears to be much improved.
From:Kleinedler, John [JKLEINEDLER@broward.org]
Sent:Wednesday, May 01, 2013 4:09 PM
Cc:email@example.com; Fontan, Manuel; Brunner, Scott; Zhu, Charlie
Subject:SW 10 Street and SW 28 Avenue Signalization
The cycle duration and sensor use employed here is typical for a coordinated signal in Broward County which is notunique to this particular location. Please continue reading as I attempt to explain or clear up any misconceptions on the operation of the traffic signal.
During coordinated signal operation, the signal has one opportunity to display each movement, as needed, once everytwo and a half minutes. The green for 28th displays only as needed and will vary depending the number of vehicles attempting to exit the neighborhood. Once the vehicles exit the neighborhood, the green reverts to the major roadway and stays there until the next cycle of the signal. This maximizes traffic flow on SW 10th and is necessary to coordinate SW 10th between Powerline to the west and Military Trail to the east. Those intersections actually govern the cycle duration at 28th.
The sensors function to display green, as needed, for all secondary movements at the intersection. If there are severalvehicles waiting to exit the neighborhood, a generous amount of green time is available to exit the neighborhood provided the motorists disperse at a normal rate. Conversely, the movement will be skipped during the cycles when no vehicles are present exiting the neighborhood.
You are correct that from about midnight to 6 AM each night, the signal operates effectively in an “on demand” mannerwith minimal delay to the minor approaches. This is known as “free” (non‐coordinated) operation and is also employed countywide since signal coordination is not critical during overnight hours. Coordinated operation starts at 6 AM week days and this is when a two and a half minute cycle is employed. The sensors continue to function in both “free” and “coordinated” modes. We recently dispatched a technician to the location and he confirmed that sensors are operating properly.
I have the same situation exiting my neighborhood with a signal that operates identically to the one at SW 10th and SW 28th . Before the signal was built, I was personally opposed to it as I knew it would significantly increase the delay exiting the neighborhood, especially during time periods between morning and evening rush hours and on weekends when you could easily proceed without a signal. Once the signal is in place however, the timing engineers are expected to maintain maximum traffic flow on the major roadway. That objective is impossible if the signal were allowed to cycle on demand at all times.
Hopefully this provides a better understanding of signal operation. Delay complaints are common however they are notindicative of a signal malfunction; instead they are really just a byproduct of signal coordination.
John Kleinedler PE PTOE
Broward County Public Works
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