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Section 4.0 – Environmental Setting and Discussion of Impacts <br /> <br /> <br />City of Redwood City 94 Initial Study/Mitigated Negative Declaration <br />Sandpiper Elementary School Facilities Expansion November 2016 <br />3. The traffic volumes at the unsignalized intersection satisfy the Caltrans Peak Hour Volume <br />Signal Warrant for traffic signal installation. <br /> <br />The City considers a traffic impact to be satisfactorily mitigated when measures are implemented that <br />eliminates the project impact. <br /> <br />4.16.3.2 Project Trip Estimates <br /> <br />The amount of traffic generated by a project and the locations where that traffic would appear are <br />estimated using a three-step process: 1) trip generation, 2) trip distribution, and 3) trip assignment. <br />Trip generation estimates the amount of traffic entering and exiting the site during the AM and PM <br />peak hours. The AM peak hour of school generated traffic coincides with the AM peak period of <br />adjacent street traffic and is from 7:00 AM to 9:00 AM. The PM peak hour of school generated <br />traffic occurs during the pick-up of students and is from 2:00 PM to 4:00 PM. The PM peak hour of <br />school generated traffic does not coincide with the PM peak hour of adjacent street traffic, which is <br />from 4 to 6 PM. Trip distribution estimates the directions the project trips would travel to and from <br />the site. Trip assignment is the assignment of the project trips to the roadways and intersections <br />based on the trip distribution. These procedures are summarized below and described in more detail <br />in Appendix F of this IS. <br /> <br />Trip Generation <br /> <br />Peak hour trip counts were completed at the project site and trip generation rates were calculated by <br />dividing the AM and PM peak hour trip counts by the school enrollment. The results are shown in <br />Table 4.16-3. Based on the results of the trip generation analysis, Sandpiper Elementary School has <br />a trip generation rate of 0.98 and 0.69 trips per student during the AM and PM school peak hours, <br />respectively. The trip generation rates include trips by both staff and students. To be conservative, <br />however, the traffic analysis added one trip per staff member to the AM peak hour. No staff trips <br />were added to the PM peak hour, because school staff typically remain on campus for one or two <br />hours after school ends. <br /> <br /> <br />Table 4.16-3: Existing Trip Generation Survey Results <br /> AM Peak Hour PM Peak Hour <br /> Trips <br />In <br />Trips <br />Out <br />Total <br />Trips <br />Trip <br />Rate <br />Trips <br />In <br />Trips <br />Out <br />Total <br />Trips <br />Trip <br />Rate <br />Driveway 202 174 376 <br />0.98 <br />118 133 251 <br />0.69 <br />Egret <br />Lane 60 60 120 51 51 102 <br />Total <br />Trips 262 234 496 169 184 353 <br /> <br /> <br />7.A. - Page 125