Appendix H - Transportation Supporting Information COMBINED

Transportation Impact Study for Hidden Canyon Residences & Preserve March 2023 Page | 29 4.2 PROJECT VEHICLE TRIP DISTRIBUTION AND ASSIGNMENT Trip distribution is a process that determines in what proportion vehicles would be expected to travel between the project site and various origins and destinations outside the project study area and also determines the various routes that vehicles would take from the project site to each destination using the calculated trip distribution. Trip distribution assumptions for the proposed project were developed based on existing travel patterns, knowledge of the study area, and consultation with City staff. Figure 9 illustrates the predicted distribution of project vehicle trips and Figure 10 illustrates the anticipated trip assignment at each study intersection, based on existing travel patterns in the area. The assigned project trips were then added to traffic volumes under Existing Conditions to generate Existing plus Project Conditions traffic volumes. 4.3 TRAFFIC IMPACT FINDINGS – EXISTING PLUS PROJECT CONDITIONS The analysis of Existing plus Project LOS at study intersections is based on the addition of project vehicle trips to existing traffic volumes. The anticipated volume of motor vehicle traffic under Existing plus Project Conditions during the a.m. and p.m. peak hours at each study intersection is illustrated on Figure 11. The intersection LOS analysis results for Existing plus Project Conditions are summarized in Table 6. Detailed calculation sheets for Existing plus Project Conditions are contained in Appendix D. With the addition of traffic generated by the proposed project, all the signalized study intersections would continue to operate acceptably at LOS D or better during both the a.m. and p.m. peak hours. During the a.m. peak hour the stop-sign controlled intersection of Schaefer Ranch Road & Dublin Canyon Road experiences would continue to experience delay consistent with LOS E on the stop-sign controlled approach (southbound Schaefer Ranch Road approaching Dublin Canyon Road), with added delay increasing by less than one second due to the project. Side-street approach volumes exceed the peak- hour signal warrant at the intersection of Dublin Canyon Road with Schaefer Ranch Road under existing conditions, though the project is not anticipated to add traffic to the stop-controlled approach. Overall average delay for the intersection would remain consistent with LOS A. The project would not result in deterioration of controlled movement at an unsignalized intersection from LOS E or better to LOS F and the project impact would be less than significant. With installation of a traffic signal at the intersection of Dublin Canyon Road with Canyon Meadows Drive (which is being coordinated between the developer and the City to enhance traffic operations and safety), the intersection is expected to operate at LOS A during both peak hours. Traffic impacts resulting from the project would be considered less than significant based on city standards.