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11-07-07-WS/PC
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11-07-07-WS/PC
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11/12/2015 12:24:36 PM
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11/1/2007 3:46:16 PM
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<br /> <br />. County Road E/Lexington Avenue. As presented in Figure 3, this intersection <br />operates at LOS D for all four scenarios during the p,m. peak hour. In addition, <br />all individual movements operate at LOS D or better for all scenarios, except for <br />the eastbound left turn. Eastbound left turn movements operate at LOS F for all <br />four scenarios, We identified a potential measure to mitigate the LOS F condition <br />under all four scenarios for eastbound left turn movements. Specifically, we <br />determined that LOS D could be provided for this movement, while maintaining <br />LOS D for the intersection as a whole, by shifting about 13 seconds of green time <br />for an average cycle during the p.m, peak period from westbound through <br />movements to eastbound left turns. The actual adjustments to the traffic signal <br />controller that are needed to achieve a longer green time for eastbound left turns <br />should be determined based on actual field conditions at the time of such <br />adjustments, To maintain signal coordination along Lexington Avenue, we <br />recommend that this measure be implemented without changing the cycle length <br />or any other signal coordination parameters, It is important to note that the need <br />for this mitigation measure already exists, and the proposed development will not <br />materially alter that need, <br /> <br />. County Road E/site access, Motorists exiting the Arden Plaza development via <br />the driveway on County Road E presently experience LOS F during the p.m. peak <br />hour. Exiting movements will continue to experience LOS F at both driveways <br />upon completion of the proposed redevelopment during the p.m. peak hour. <br />Delay values for all movements under all scenarios are presented in the Synchro <br />worksheets, which are included in the appendix, The capacity analyses revealed <br />two principal reasons for the LOS F operation at this intersection: a) insufficient <br />gaps on the mainline due to high through traffic volumes on County Road E and <br />b) short storage for exiting right turns, No feasible mitigation measures are <br />available for the driveway intersections that would improve the availability of <br />gaps on the mainline for exiting motorists, However, the storage lengths for right <br />turns can be lengthened, <br /> <br />Based on the results of the capacity analyses, we recommend that the storage <br />length for exiting right turns on the driveway on County Road E be extended to <br />the south edge of the retail building A (pharmacy), which will provide a total <br />storage length of about 190 feet. This change will reduce the average delay for <br />exiting movements. To make it easy to understand for exiting motorists and <br />thereby, provide efficient operations, we recommend that a stop sign and a lane <br />assignment sign be provided on the driveway approach to County Road E. The <br />signing should be installed per standards presented in the Minnesota Manual on <br />Uniform Traffic Control Devices, <br /> <br />No other mitigation measures are necessary at this intersection in conjunction <br />with the proposed development. However, if needs arise in the future to improve <br />the overall traffic operations on County Road E in this area, City and County staff <br />could consider a contingency measure that would restrict the site access on <br />County Road E to % access only. A % access at the County Road E/site access <br /> <br />9 <br />
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