AgdaPkt 2010-02-01 clsd and regular

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Sa/tworks Proposa/- Transportation Group Summary Report (22 January 2010) 7A - ATTACHMENT NO.4 Page 17 3.2.2 Trip Distribution Peak hour traffic forecast plots and a select zone analysis plot for the Saltworks traffic analysis zones were prepared by Hexagon and reviewed by Fehr & Peers to understand the trip distribution pattern and assignments from the preliminary modeling. A review of the three major external connections into the project (Marsh Road, the new overcrossing of US 101 between Woodside and Marsh Roads, and Blomquist Street) showed that Blomquist Street and the new overcrossing were used more heavily than Marsh Road. The proportion of external peak-hour traffic generated by Saltworks and assigned to these three external connections were: . Blomquist Street - 40 percent . New Overcrossing of US 101 - 38 percent . Marsh Road - 22 percent Traffic at Marsh Road was split onto Bayfront Expressway (SR 84), Marsh Road and US 101. Traffic using the new US 101 overcrossing was destined to the Midpoint Technology Park area, downtown, Woodside Road, EI Camino Real, and Middlefield Road. Traffic using Blomquist Street was divided among Woodside Road, Maple Street, and Whipple Avenue. A general observation of the trip distribution from the City of Redwood City model for the project traffic analysis zones was that it showed a relatively low percentage (less than 5%) of the project peak hour traffic assigned to the south on US 101 and east on the Bayfront Expressway. While the percentage of trips traveling to the north on US 101 was larger (-10 percent), it appeared lower than expected. The distribution of Saltworks traffic to the regional facilities should be closely reviewed during the CEQA process. 3.3 INDEPENDENT ESTIMATES Fehr & Peers prepared independent trip generation estimates as part of the review process. This analysis relied on off-model estimates using industry-adopted standards and practices. These estimates are general estimates for the purpose of this review and more detailed/refined estimates would need to be prepared during a CEQA analysis. The results were used to evaluate the preliminary estimates prepared by Hexagon and to assess the adequacy of the proposed external connections. 3.3.1 Trip Generation The numbers of daily and peak hour vehicles trips generated by the proposed Saltworks project were estimated by applying ITE rates to the proposed land uses and considering internalization reductions for mixed-use developments. These preliminary trip generation estimates are presented in Table 2. It should be noted that these trip generation estimates do not fully account for the anticipated reductions due to transit usage and the proposed travel demand management program. However, they are similar to and slightly lower than the estimates generated by the Saltworks consultants and produced by the preliminary modeling that was used to estimate the needed capacity for the gateway roadways to the projects. Therefore, the preliminary estimates are appropriate for the preliminary roadway system assessment. 3.3.2 Trip Distribution Fehr & Peers reviewed the 2000 Census data for residents of Redwood City who work outside Redwood City. Based on this information, the number of trips assigned to the freeways would be greater than what the model projected for the peak hour. Using a manual approach based on the census journey-to-work data the percentage of commuters using the freeways was estimated to be: north (20 percent), south (20 percent) and east (9 percent) of Redwood City. The difference between these estimates and the preliminary model results demonstrate that there is a need to closely review the model's sensitivity to capture the full effects of this scale of regional project. 10