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Citywide Engineering & Traffic Survey Project Approach <br />Task 2 - Speed Data Analysis <br />Transportation Studies, Inc. will provide AGA with radar speed survey data for the 200 <br />roadway segments. AGA will summarize the field data and provide speed survey data <br />sheets (including cumulative speed curves), as contained in our Sample Engineering and <br />Traffic Survey Summary Tables presented in Appendix D. <br />AGA will also coordinate with adjacent jurisdictions (e.g., the Cities of Costa Mesa, <br />Irvine, Tustin, Orange, Garden Grove, and Fountain Valley) regarding speed limits for <br />highway segments abutting or under joint control with the City of Santa Ana. <br />Task 3 - Roadway Segment Characteristics and Speed Limit Sign Locations Review <br />This task will be performed by Mr. Mark Miller, P.E., a registered Civil Engineer and <br />Traffic Engineer in California. Mr. Miller will drive all of the street segments to <br />determine, on the basis of experienced traffic engineering judgment, whether or not there <br />are any roadway characteristics not readily apparent to the motorist which would justify <br />the lowering of the proposed speed limit to the maximum reduction permitted under the <br />State established guidelines. Factors considered will include street width and alignment, <br />traffic flow characteristics, number of lanes and other channelization and striping <br />patterns, frequency of driveways and intersections, reversed super elevations, visibility <br />obstructions caused by vertical or horizontal curves, roadside land use, grade, heavy <br />pedestrian or truck traffic, heavy on -street parking maneuvers, and any other roadside <br />conditions that are not apparent to the motorist. The field reviews for traffic factors will <br />be conducted while school is in session. <br />As part of this work, locations of all speed limit signs will be reviewed in the field to <br />ensure that the speed limit signing is in accordance with the adopted speed limits per the <br />previous speed survey report. Any speed limit sign location modifications recommended <br />will be noted. The field survey will be documented for analysis purposes. <br />The product of this review will be a summary of each of the study segments and <br />identification of the study segments which justify consideration for maximum <br />increase /decrease in the recommended speed limits. <br />Task 4 - Accident History Review and Accident Rate Calculations <br />Under this task, Mr. Mike Evans of AGA will review the mid -block accident history of <br />each of the street segments to be included in the survey. For this purpose, the SWITRS, or <br />City maintained accident report data, will be used in conjunction with the City's <br />Crossroads Accident Database Program, and the appropriate accident rate for each study <br />link will be calculated. If recent ADT counts are not available from the City, existing <br />counts will be multiplied by an appropriate growth factor (supplied by the City) to <br />estimate current traffic volumes. The calculated accident rate will be compared with the <br />expected accident rate for various types of roadways. <br />Albert Grover & Associates 7 <br />