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Implementation Issues

This section provides a brief overview of traffic signal and controller equipment and implementation problems encountered by each agency implementing the flashing yellow arrow.

The following cities are included in this section:

Montgomery County, MD

Woodburn, OR

Jackson County, OR

Beaverton, OR

Tucson, AZ

Broward County, FL

Montgomery County, MD

Implementation Issues
The implementation of the flashing yellow arrow required 12-inch lenses; therefore, the existing 8-inch lens used in the 5-section cluster was replaced with a completely new signal display arrangement. The County installed new conductor wire for the additional flashing yellow arrow indication. The opposing through-lane indication drove the flashing yellow arrow indication. The previous operation was a circular green indication

Local Intersection Management
Traffic control is managed with Econolite controllers model KMC 8000 (TS-1).  To prevent the conflict monitor from detecting what it “thinks” is a malfunction, the County elected to apply special external logic units. The special logic created by Montgomery County staff is shown in Appendix B of
Working Paper 8.

Reported Problems
Following initial turn-on, the county received a few phone calls and e-mails alerting the county that a signal had “malfunctioned.”  The county has had good results with this implementation, based on the number of calls and feedback from the citizens.

Woodburn, OR

Implementation Issues
ODOT created a command box logic for the FLASHING YELLOW ARROW display implementation. A copy of that logic is shown in Appendix B of
Working Paper 8.

Reported Problems
Neither the City of Woodburn nor ODOT received very many calls, e-mails, or letters in response to the two flashing yellow arrow implementations.


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