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2007-11-28 CC Packet
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2007-11-28 CC Packet
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<br />Jane Rose <br />Jack Corkle <br /> <br />October 16, 2007 <br />Page 3 <br /> <br />· In reviewing the CSAH 14 Study that was completed by SRF, the intersection of CSAH <br />14/20th Avenue was found to operate at an unacceptable LOS E during the p.m. peak hour <br />under all-way stop control. The Centerville EA W traffic analysis documented that this <br />intersection is operating at LOS C during this time period. In comparing the intersection <br />turning movements, the volumes increased during both the a.m. and p.m. peak periods <br />between 2004 and 2007, which would indicate similar or worse operations. <br /> <br />Due to the discrepancy, analysis was completed for this intersection with the current <br />traffic volumes and all-way stop control using the Highway Capacity Software and <br />Synchro/SimTraffic software package. Based on this analysis, we found this intersection <br />to operate at an overall unacceptable LOS E during the p.m. peak hour. This intersection <br />should be checked to ensure that adequate capacity is provided for existing and future <br />conditions. <br /> <br />· The 2012 operations analysis assumed upgrades to the CSAH 14 corridor that are <br />scheduled to be completed in 2009, including signalization of CSAH 14/20th Avenue and <br />widening CSAH 14 to improve the 90-degree curve just west of the intersection with <br />CSAH 21 (Centerville Road). No additional improvements are recommended. Based on <br />the CSAH 14 roadway design plans that will be constructed next year, the southbound <br />approach of 20th Avenue at CSAH 14 should consist of dual left-turn lanes, one through <br />lane, and a shared through/right-turn lane. It appears that this study analyzed this <br />approach with dual left-turns lanes, one through lane, and a right-turn lane. Although this <br />will not significantly impact operations, the correct future geometrics should be noted in <br />the study. In addition, the geometrics shown on this approach are not consistent <br />throughout the report for 2030 conditions. Based on the operations analysis shown in the <br />appendix of the report, dual southbound left-turn lanes were included. <br /> <br />· For 2030 conditions, the roadway upgrades identified for 2012 conditions are assumed as <br />a baseline. However, the improvements were recommended to be modified to improve <br />safety. The modified improvement includes the installation of a northbound left-turn lane <br />instead of a right-turn lane at the intersection of CSAH 14/Centerville Road. In addition, <br />installation of a southbound left-turn lane is recommended at this intersection, with future <br />signalization, to align the left-turn lanes on the north and south approaches. Installation of <br />a southbound right-turn lane at CSAH 14/Progress Road is also recommended. <br /> <br />Based on our analysis, the suggested modifications to the roadway geometrics will not <br />change the overall intersections operations, and it may provide some additional safety for <br />the intersections and flexibility in providing future left-turn phasing. In regards to the <br />southbound right-turn lane at Progress Road/CSAH 14, this improvement does not <br />significantly improve operations or safety, based on our review. If the right-of-way is <br />available to construct a right-turn lane on this approach, it would provide some delay <br />reduction to that individual movement. <br />
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