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Traffic Study <br />Lexington Avenue Reconstruction <br /> <br /> <br />Alliant No. 118-0186.0 43 <br />April 18, 2019 <br />Lexington Avenue & County Road E <br />Proposed improvements: <br />x Modify the WB approach median to offset the left-turn lane further south <br />Key benefits include: <br />x Provides operational benefit during peak and non-peak periods <br />o Expected to operate at overall LOS D or better under forecast year 2040 conditions <br />x Eliminates EB/WB split phase signal timing <br />x Provides flexibility for protective/permissive, protected only, or permissive only operation <br />as determined through a FYA assessment analysis <br />Key design considerations include: <br />x Reconstruction of the westbound approach is required in addition to restriping and <br />resigning east of the intersection <br />x Requires a new 55-foot mast arm in addition to a 5-foot mast arm extender for the <br />WB traffic signal indications (NW quadrant signal pole) <br />x Provide four-section left-turn heads with FYA indications on all approaches <br />o Operate the EB/WB left-turn movements as protected only all day except for overnight <br />periods or as deemed appropriate through a FYA assessment analysis <br />o Operate the NB/SB left-turn movements as protective/permissive all day except for <br />overnight periods <br />Optional Improvements <br />Additional improvements that are not warranted based on operational and safety analyses but may <br />be included as part of the overall reconstruction of the Lexington Avenue corridor include: <br />x Add a dedicated NB right-turn lane at Grey Fox Road <br />x A three-quarter access at the Shannon Square driveway is acceptable if RIRO access is not <br />feasible (EB left-turns prohibited)