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Redwood City Costco Gasoline Expansion 7.A. - Page 266 August 14,2012 ruye 3 INTERSECTION LEVEL OF SERVICE Using the peak hour traffic counts and existing lane configurations and signal timing information, weekday p.m. peak hour and Saturday midday peak hour intersection levels of service for the three intersections were also calculated. The results of the intersection operational analysis are also summarized in Figures 1 and 2 for the respective time periods. The intersection level of service results summarized in the figures are based on the Highway Capacity Manual 2000 procedures. As can be seen from the figures and as experienced in the field, the Middlefield Road/Woodside Road intersection is operating essentially at capacity (volume-to-capacity ratio of 0.98) during the weekday p.m. peak hour. Although not specifically represented in Figure 1, the capacity constraint at the Middlefield Road/Woodside Road intersection does lead to queuing along both roadways during the peak time periods and can impact operations of adjacent intersections and site access points. Based on these observations and input from the public, the City of Redwood City and Costco are currently beginning dialogue with CalTrans to investigate potential signal timing changes or other enhancements to address the existing peak hour congestion at the Middlefield Road/Woodside Road intersection.Attachment 2 contains the detailed traffic operations analysis worksheets. PROJECT IMPACT ON INTERSECTION LEVELS OF SERVICE As requested by the City of Redwood City, a preliminary assessment of the impact of the proposed fuel station expansion project on existing intersection levels of service was also conducted. The assessment was conducted for the critical weekday PM peak hour. The additional external trips associated with the proposed fuel station expansion were assigned to the study intersections based on existing travel patterns and turning movements. These assigned project trips were then added to the existing conditions traffic volumes to develop "existing plus project" traffic volumes for the weekday p.m. peak hour. The "existing plus project" traffic volumes plus the corresponding weekday p.m. peak hour intersection levels of service are summarized in Figure 1. As can be seen from the figure, the additional traffic generated by the proposed fuel station expansion will not have a significant effect on existing levels of service or volume-to-capacity ratios at the study intersections. All intersection levels of service remain the same with the addition of project traffic volumes and there are only minor changes in overall intersection average delay and volume-to-capacity ratio. Kittelson&Associates,Inc. Boise,Idaho