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01/07/2004 14:02 FAX SEH ST. PAUL I4J O()~ ~SeJ MEMORANDUM 3535 Vadnais Center DrivEl, St. Paul, MN 55110-5196 651.490.2000 800.325.2055 651.490.2150 FAX TO: Thomas Paschke, Roseville City Planner FROM: Glen Van Wormer, Senior Transportation Engineer DATE: January 7,2004 RE: Traffic Study for SuperAmerica Lexington A venue and County Road B SEH No. A-MPLSTR9701.00 14.00 As you requested. we have completed a capacity analysis of the existing traffic volumes at the intersection of County Road B and Lexington Avenue. We utilized the latest traffic volumes provided by the Ramsey County Public Works Department that were completed in 2001. As indicated in the initial report. traffic volumes have changed little in the past 10 years. Therefore, the volumes at the intersection are assumed to have had little change also since 2001. The capacity analysis takes traffic volume information for each of the turning movements at the intersection, along with the lane arrangements and a number of other variables, such as percent of trucks, and calculates a level of service (LOS). The LOS is graded from A through F, similar to school grades. A l.OS A indicates free flow conditions with no dela.ys. A LOS F indicates traffic has a significant delay and the backup of traffic is great enough that not all traffic clears the intersection during a single traffic signal cycle. A LOS D is usually the design criteria for metropolitan area intersections with l.OS E acceptable for short periods of time. The calculations we completed indicate the overall intersection operates at LOS D in the p.rn. peak hour, at LOS C during the noon hour, and at LOS B in the a.m. peak hour. During both the noon hour and the a.rn. peak hour, the calculations show there is little congestion except for southbound through traffic in the a.m. and the noon hour and for the northbound through movement in the noon hour. However, these still continue to operate at LOS C or better. In the p.m peak hour, the calculations show a satisfactory operating intersection, but also indicate congestion can occur for both eastbound tbrough traffic and northbound through traffic. The volumes may be high enough so occasionally some traffic may not totally C?lear the intersection on a single signal cycle. The numbers shown in the capacity print out are satisfactory and acceptable since some p.rn. peak houl: congestion is anticipated on tl1ajor streets. With the lack of historical growth in traffic volumes, and no reason to believe the pattern will change, the intersection should continue to operate at a satisfactory, but busy condition in the future. The additional traffic coming from the liquor store represents such a sman percentage of traffic in the intersection that there would be nO change in any of the calculated results. If you have questions or need additional information, please feel free to call me. t10 ~ ;\l;~\n~prl\'l70j OOIoQrmpolld,ncelpallCllkcJO 10704.doc Short Elliott H~ndrtckBon Inc. Your Trusted Rl!:!IlUrC6 . Eqv~ Oppexlunity EmplO}/Gr