Item 5 - PH on Laurel Hill Plan - Laserfiche WebLink

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Larson Property Traffic Impact Study Pa§e 11 The results of the analysis shows that all intersections will operate at acceptable V/C ratios with or without the Larson property plan amendment and zone change. Even with all traffic routed through the I-5 interchange area and no reduction for residential traffic allowed under the current plan and zoning, the impacts of the Larson property zone change are minimal. Under signalization, the Glenwood Blvd. at NB 1-5 Ramp and the Glenwood Blvd. at Glenwood Dr/Moon Mountain Dr. intersections will operate within the ODOT mobility parameters, however queue lengths for turn pockets north and south of the overpass may exceed the storage lengths provided. The queues were not lengthened by the Larson property development, however, so no mitigation measures are required. V. Mitigation The results of the operational analyses for 2004 and 2019 indicate that all intersections will operate within the ODOT and City of Eugene mobility standards and therefore no mitigation is required for the Larson property proposed plan amendment and zone change. VI. Findings and Recommendations~ The £mdings of this traffic impact study are that development under the proposed plan amendment and zone change can be accommodated by the surrounding transportation system given the mitigation measures required for the Son Blaze development. Contrary to the results of the signal analysis in the JRH study, this study finds that the intersection of Glenwood Blvd./Glenwood Dr/Brackenfern Dr./Moon Mountain Dr. will operate with acceptable V/C ratios and queue lengths with a single-lane Moon Mountain eastbound approach and concurrent east-west phasing. The westbound approach does not require a second left-turn lane, In fact, queue lengths are shown to increase when the eastbound approach is removed because the eastbound through and left-turn traffic is transferred to northbound movements lengthening the north-south green time and increasing the east-west green time. This study recommends that the Moon Mountain eastbound approach to Glenwood Blvd. remain open. This will eliminate the need for a connecting roadway from Moon Mountain Drive to 25* Avenue east of Laurel Hill Drive and eliminate the diversion of traffic from Moon Mountain Drive south on the narrow 20-foot wide section of Laurel Hill Drive to 25* Avenue. Access Engineering December 1, 2003 II-B-37