2007-11-28 CC Packet - Laserfiche WebLink

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Response: The two regional access locations mentioned are not currently in the State or County's Construction Improvement Plan. Nor have plans been developed for these potential connections. Given that current status, it did not seem prudent to include in this study. Furthermore, these regional connections would result in a more centralized distribution around the proposed development. This would reduce the expected traffic at the study intersections and improve their levels of service. Therefore, studying the corridor without these improvements represents a worst case scenario. 9. Comment Summary: In regard to operations and capacity impacts for the proposed development, the EAW analysis indicates that all intersections are currently operating at LOS C or better during the peak periods. In reviewing the CSAH 14 Study that was completed by SRF in 2004, the intersection of CSAH 14/20th Avenue was found to operate at an unacceptable LOS E during the p.m. peak hour. In comparing the intersection turning movements, the volumes increased during both the a.m. and the p.m. peak periods between 2004 and 2007, which would indicate worse operations. Due to the discrepancy, an analysis was rerun. The intersection was found to operate at LOS E during the p.m. peak hour. This intersection should be checked to ensure that adequate capacity is provided for existing and future conditions. Response: The results presented represent an average of five model simulations from the Synchro/SimTraffic software package. The simulation included all study intersections, represented one full hour during either the a.m. or p.m. peak, and accounted for a peak hour factor. Following receipt of this comment, the intersection volumes and analyses were re-examined and found to be correct. The simulation was run again with similar results. The results for the existing timeframe also coincided with our observations of traffic during the peak periods. While an exact level of service cannot be determined from observations, the traffie operations witnessed did not exhibit signs of an intersection nearing failure with excessive congestion and delays. 10. Comment Summary: In regard to operations and capacity impacts for the proposed development, the 2012 operations analysis included the current improvements. This includes a traffic signal at CSAH 14 and 20th Avenue. No additional improvements were included in the EAW. Based on the CSAH 14 design plans, the southbound approach of 20th Avenue at CSAH 14 should consist of dual left-turn lanes, one through lane and a shared through/right-turn lane. It appears that the EAW used different geometries for its analysis. The correct geometries should be noted in the EAW. Response: The traffie analyses used dual left turn lanes, one through lane, and one exclusive right turn lane for the southbound approach of 20th Avenue at Main Street (CSAH 14). It is acknowledged that this is different geometry than that being constructed. Using the planned geometry for this approach would likely result in better levels of service than those presented in the report and would not change the conclusions of the traffic study. 11. Comment Summary: In regard to operations and capacity impacts for the proposed development, the geometrics shown in the EAW for the CSAH 14/20th Avenue approach are not consistent throughout the report for 2030. Centerville Downtown Redevelopment Page 11