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I <br /> I Draft Memorandum Z1 <br /> Perteet <br /> 2707 Colby Avenue,Suite 900,Everett,WA 98201 I P 425.252.7700 I F 425.339.6018 <br /> I <br /> ..,.,..,"............... " „.. ! ...willow, .............., <br /> i <br /> i <br /> � �. so 1 •o�, <br /> I <br /> i '-'---.,G----_, , <br /> !III �'�--- -""" 1 1 <br /> • 4 ll i <br /> 0 \ <br /> ``` P-k /� ©Y.. I <br /> a <br /> �, 7O ° COS'' o <br /> ID <br /> 0 a- <br /> ,/'' / \ \ <br /> Figure 9—Tandem Signal Configuration <br /> IThe example design shown in Figure 9 uses eight new signal poles.The existing pole for the PUD driveway is the <br /> only retained element from the existing setup.While it is possible that the existing controller could support the <br /> I operations at the two closely-spaced intersections, the City of Everett will likely request that a new controller <br /> and cabinet be installed due to the age of the current equipment and because the existing controller will need <br /> to be temporarily disconnected in order for the roadway to expand.Using a new controller could allow for new <br /> Isignal equipment installation prior to the removal of the existing,reducing traffic control needs. <br /> Left-turn phasing at each intersection is dependent on either opposing volumes or transit needs. At both <br /> intersections,protected phasing for the westbound left movement is recommended to allow enough clearance I <br /> for coaches and PUD vehicles to make the left turns. <br /> In order to make a tandem signal operate using one controller,overlap phasing must be employed. Below is a <br /> Ipossible phasing diagram that could control the configuration shown in Figure 9. <br /> I <br /> IPage 9 <br /> File location:X:\Community Transit\Projects\20I 10155-Community Transit On-Call\.016-Seaway Transit Center Preliminary Engineering\Traffic\Submittals\02- <br /> Revision based on Katherine Casseday Comments\Seaway Transit Center -DRAFT Traffic Memorandum.docx <br /> I <br />