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21 <br /> <br />triggered as these are both considered acceptable. If traffic goes from LOS D to LOS E, <br />a new significant impact would occur and further environmental analysis would be <br />required because of the change from an acceptable level of service to an unacceptable <br />level. Thus, for the Hopkins Avenue example, it would take an additional 780 Peak AM <br />trips or 873 Peak PM trips to lower the level of service to LOS E and trigger additional <br />CEQA analysis. <br /> <br />Travel demand models estimate changes in traffic based on existing travel volumes and <br />patterns, potential changes to the transportation network, and potential land use <br />changes. In spite of all the effort to make these models as robust as possible, they are, <br />at the end of the day, an approximation and we expect them to underestimate changes <br />on some streets and to overestimate them on others. Just as Hopkins traffic volumes <br />are higher than estimated, recent traffic volumes on other streets are both lower than <br />the future estimates as well as lower than the 2008 volumes. This was the case on <br />Massachusetts Avenue (between Woodside and Alameda de las Pulgas) as shown in <br />Table 6 below. <br /> <br />Table 6: Comparison of General Plan and Recent Traffic Volumes on <br />Massachusetts Avenue (Woodside to Alameda de las Pulgas) <br /> “Existing” <br />Volume <br />(2008) 2 <br />“Project” <br />Volumes <br />(2030) <br />Recent <br />Traffic <br />Count3 <br />Volume <br />Threshold <br />for LOS E4 <br />Additional Volume <br />Required to Trigger <br />Impact (LOS E) <br />Average Daily <br />Traffic (ADT) 9,1001 --- 6,800 --- __ <br />AM Peak <br />Hour Volume 986 1,030 364 1,610 1,246 <br />PM Peak <br />Hour Volume 789 860 625 1,610 985 <br />1 Redwood City New General Plan Technical Report (September 2008). Figure 7: Roadway Segment Average Daily <br />Traffic Volume <br />2 Redwood City New General Plan Draft EIR (May 2010). Table 4.14-2 Existing (2008) Roadway Segment Levels of <br />Service Summary <br />3 Traffic counts collected August 2012. <br />4 Redwood City New General Plan Draft EIR (May 2010). Table 4.14-1 Roadway Segment LOS Thresholds <br /> <br /> <br />Downtown Precise Plan Traffic Projections <br />Similarly, an EIR was prepared for the Downtown Precise Plan. The EIR was certified <br />on January 24, 2011. As required by the California Environmental Quality Act, the <br />DTPP EIR examined several traffic scenarios. Each of these scenarios builds on the <br />last, to provide decision makers with a comprehensive picture of potential traffic <br />conditions. The scenarios are as follows: <br />8.C. - Page 21