Appendix A Traffic Analysis Report

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TRAFFIC IMPACT ANALYSIS FAIRVIEW STREET IMPROVEMENTS FROM 9T" STREET TO 16T" STREET AND /\ JUNE 2018 BRIDGE REPLACEMENT PROJECT J" SANTA ANA, CALIFORNIA Center Drive under 2040 Build a.m. peak -hour conditions. To mitigate the potentially impacted a.m. peak -hour condition, the following mitigation measure is proposed: • Restripe the westbound shared left -through turn lane to a shared left -through -right turn lane. The allowance of westbound right turns from the westbound shared left -through turn lane is anticipated to improve the 2040 Build condition a.m. peak -hour intersection v/c ratio from a deficient 0.908 (LOS E) to an acceptable 0.842 (LOS D). The 2040 Build condition p.m. peak -hour intersection v/c ratio is anticipated to improve from an acceptable 0.876 (LOS D) to an acceptable 0.810 (LOS D). As this impact and deficiency are not anticipated to occur until the 2040 Build condition, it is recommended that this improvement not be implemented until deemed necessary. This should be done through intersection operations monitoring (particularly of the westbound right -turn movement) by City staff. CONCLUSIONS The existing conditions analysis shows that the roadway of Fairview Street between 9th Street and 16th Street experiences higher levels of daily traffic than what the current roadway configuration is designed for. The proposed improvement of Fairview Street from four through lanes to six through lanes between 9th Street and 16th Street is anticipated to accommodate future traffic volumes within capacity at satisfactory LOS. The additional capacity afforded to north -south traffic along Fairview Street will not alleviate, and may increase, anticipated delays to left -turning vehicles entering and exiting the unsignalized streets of 16th Street, 12th Street, and 9th Street. Once the project is completed, vehicles turning in/out of the residential neighborhoods may utilize alternate routes along Fairview Street, such as U-turns, to more conveniently travel to their intended destinations. This potential rerouting of left -turns would affect a modest number of vehicles, less than 10 per peak hour at any one intersection. Additionally, the project's improvement to north -south traffic capacity along Fairview Street is anticipated to result in unacceptable LOS E operations at the intersection of Fairview Street and Civic Center Drive under the 2040 Build a.m. peak -hour condition. The project's significant impact can be mitigated through the restriping of the westbound shared left -through turn lane to a shared left -through -right turn lane. As this impact is not anticipated to occur until 2040 Build conditions, it is recommended that this improvement not be implemented until it is determined by City staff that the intersection may be approaching deficient levels of operation. Pedestrian and bicyclist facilities along Fairview Street that currently exist on both sides of the bridge but not on the bridge itself would be connected by sidewalks and Class II bike lanes that are part of the project. The closure of this gap in the pedestrian network will benefit pedestrians traveling between destinations north of 17th Street, such as Leroy L. Doig Intermediate School, Samueli Academy, the Stater Bros. Market, and the residential community south of the SAR. PAWKE1702\Traffic\doc\Traffic Analysis Report rev - Caltrans Comments.docx u06/07/18» 19