Laserfiche WebLink
Citywide Engineering & Traffic Survey <br />Project Approach <br />conduct the surveys. TSI is quite familiar with traffic conditions throughout the <br />City of Santa Ana, given their annual contract to collect traffic data at various <br />locations Citywide. <br />♦ Evaluate speed limits by reviewing current traffic count data and three years of <br />accident history at mid -block locations and intersections in conjunction with the <br />speed survey data. <br />♦ Prepare the recommendations to maintain/increase /decrease the speed limits in the <br />City. Additionally, if certain residential streets are experiencing speeding <br />problems, we will recommend that the City investigate the potential utilization of <br />various traffic calming measures to address the situation. <br />The following eight tasks have been designed to provide an orderly and efficient <br />completion of the work needed to conduct the speed zone study and the other tasks <br />described in the RFP. It should be noted that the Scope of Services outlined in the City's <br />RFP shall be considered as part of AGA's proposal. <br />Task 1- Radar Field Data Collection <br />After discussing the schedule for conducting the surveys and staff concerns at the initial <br />meeting with City engineering staff, the first task will be to conduct the field radar speed <br />surveys at the 200 recommended road segments. These radar surveys will be conducted <br />by the project subconsultant, Transportation Studies, Inc., of Santa Ana. Certifications of <br />both the equipment to be used by TSI and the personnel who will be gathering the data <br />for TSI are included in Appendix C. <br />A minimum of 100 bidirectional speed observations, with a minimum of 50 observations <br />for each direction of travel, will be obtained for all of the designated street segments, a <br />list of which will be finalized during the initial meeting with the City staff. For street <br />segments containing a raised median, the survey will include a minimum of 100 vehicles <br />in each direction of travel. The studies will be conducted during "good weather" <br />conditions and only on Mondays, Tuesdays, Wednesdays and Thursdays on days when <br />school is in session during the off -peak hours of 9:00 am. to 11:30 a.m. and 1:30 p.m. to <br />4:00 p.m., unless other specific time limits are required by the City staff. <br />Each speed zone will be checked for representative free flow speeds, that is, speeds not <br />influenced by temporary conditions or construction work. The radar gun will be calibrated <br />periodically to achieve and maintain accuracy. <br />The obtaining of a minimum 100 speed samples for each street segment will ensure that <br />there will be a 95% probability that the sample data represents the population data for this <br />type of study. <br />Albert Grover & Associates 6 <br />