Agenda - Council Work Session - 10/25/2005

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TH 47 & Pleasant Street ri'he/bllowing paragraphs summarize the discussion that Mn/DOT had with the cities of P, amsey and Anoka on Thursday September 29th. ri'his summer Mn/DOT had a project on TH 47 that included the resurfacing and rcstri ping of' the pavement on TH 47. This project also included the reconstruction of a traffic signal at the intersection of TH 47 & Pleasant St. The resurfacing and restriping occurred several weeks ago. Immediately after that we started to receive several complaints about the operations of this signal. Several things caused the poor operations in cl uditag disconnected loop detectors forcing the signal to run in a timed mode, improper signal heads and signal head alignment, and the loss of signal interconnect. Over the course of the next few weeks Mn/DOT was able to temporarily connect loop detectors and improve the operations. l:,ven still Mn/DOT and the cities are still receiving some complaints about the signal. As a rcsttlt our traffic signal operations engineer and our traffic engineer for the north metro met with the city to discuss and establish a course of action. The cities shared with Mn/1)OT firsthand observations of the traffic at and around this signal. Mn/DOT has been pcriodically observing the traffic at and around this signal via closed circuit television cameras. Mn/DOT's traffic department has been observing this signal at least twice at wcek for several weeks. After some discussion and sharing of observations the lbllowing was determined: 1.cave the signal as it currently operates until after the new signal poles and control cabinet are installed and fully operational. This should occur sometime in Mid November. * hnplcment a new signal phasing scheme: o AM peak hours - NB left turn signal would only appear if there were a car waiting in the left turn lane at the end of the cycle. o AM Peak hours - SB left turn signal would lead with a protected left turn phase and then change to permissive. o This AM phasing will allow a greater number of vehicles to proceed through the intersection SB due to the infrequency of the NB Protected Left turn phase. o PM Peak hours - NB left turn phasing would be protected when a few of cars are queued in the left turn lane and permissive if fewer than that are queued. o PM Peak hours - SB left turn phasing would lag with a protected phase if there were enough demand. Otherwise the left tums would be permissive. o This PM phasing will allow a greater number of vehicles to proceed through the intersection NB because the SB protected left turn phase will only be called if several cars are queued in the left turn at the end of the NB-SB green time. , The new traffic signal will be able to make accommodations such that the northbound to westbound left turn lane could be converted in the future to a left- thru lane.