75A - PH 3321 SOUTH FAIRVIEW ST - Laserfiche WebLink

Home Browse Search

during the evening peak hour based on intersection delay with the addition of project traffic. The intersection of Alton/Raitt is projected to continue to operate at LOS F during the morning peak hour and at LOS D during the evening peak hour based on intersection delay with the addition of project traffic. The delays at the intersection of Alton/Greenville actually improve with the project as the project is constructing a second eastbound through lane between Fairview and Greenville. Based on the ICU analysis, which is used by the City of Santa Ana to identify traffic-related impacts of development projects, and the City of Santa Ana impact traffic criteria cited on page 3 of this report, the Alton Court project does not have a significant traffic impact at the three study area intersections. The project driveway was analyzed under Existing plus Project traffic conditions using the Highway Capacity Manual (HCM) delay methodology, which measures the seconds of delay for all vehicles entering an intersection. The analysis shows that the project driveway is projected to operate at LOS B or better during both peak hours. The analysis shows that the northbound turns out of the driveway and the westbound left toms into the driveway operate at LOS B or better with average queues of less than one vehicle. ICU and HCS worksheets for the Existing plus Project analysis are provided in Appendix B of this report. RECOMMENDED IlVIPROVEMENTS The proposed project does not have a significant traffic impact on the study area intersections and thus, no mitigation measures are required of the project. However, the City of Santa Ana requires recommendations for improvements for any intersection that is shown to operate at LOS E or F during one or both peak hour, despite the project having a significant traffic impact or not. The intersections of Alton/Greenville and Alton/Raitt are both operating at LOS E/F under existing traffic conditions. Three options for recommended improvements were considered for the intersections of Alton/Greenville and Alton/Raitt. Traffic Signal Optimization The HCS software has a function where the cycle lengths and green time splits of a traffic signal can be adjusted for optimal intersection operation. This function was applied to the intersections ofAlton/Greenville and Alton/Raitt. The results of the analysis indicate that the intersections of Alton/Greenville and Alton/Raitt would operate at LOS D or better during both peak hours with traffic signal optimization. The analysis worksheets are included in Appendix B. Added Turn Lanes The intersections of Alton/Greenville and Alton/Raitt were also analyzed with added tom lanes. At the intersection of Alton/Greenville, a southbound left turn lane was added to the analysis. At the intersection of Alton/Raitt, an eastbound left turn lane and a southbound left turn lane were added to the analysis. It should be noted that these improvements at both intersections may require the acquisition of additional right-of-way. Traffic Analysis for - 11 - October, 2007 Alton Court Residential Development 75A-142