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Redwood City Costco Gasoline Expansion ProjE 7.B. - Page 447 <br /> August 4,2011 ruye v <br /> Table 2 Existing Redwood City Costco Gasoline Station Trip Generation <br /> Weekday PM Peak Hour Weekend Midday Peak Hour <br /> In Out Total In Out Total <br /> Existing Costco Gasoline Station <br /> (12 fueling positions) <br /> Total Trip Ends 200 200 400 215 215 430 <br /> Internal Trips <br /> (22°o PM,47°o MDJ �45J (45J (90J (100J (100J (200J <br /> External Trips 155 155 310 115 115 230 <br /> Pass-by Trips <br /> (22°o PM,29°o MDJ �35J (35J (70J (35J (35J (70J <br /> Diverted Trips (90J (90J (180J (60J (60J (120J <br /> (59°o PM,52°o MDJ <br /> Net New Trips 30 30 60 20 20 40 <br /> Confirmed by the results of the trip generation study at the existing Redwood City Costco Gasoline <br /> facility is the fact that the unique nature of Costco operations and its membership requirements <br /> result in different trip characteristics than those observed at the standard fuel stations summarized <br /> in the ITE Trip Generation guidebook. The percentage of pass-by trips at Costco fuel stations is lower <br /> than that quoted in the ITE guidebook for typical fuel stations. Correspondingly, membership <br /> requirements also have a significant effect on trip internalization (or sharing of trips) between the <br /> warehouse and the fuel station. Fewer people exclusively visit a Costco fuel station (in comparison to <br /> a typical standalone station) because they have another primary purpose for visiting the site (that <br /> being a trip to the warehouse). <br /> Internal Trips <br /> A key finding from the data collection is that approximately 22% of the weekday p.m. and 45% of the <br /> Saturday midday peak hour trips to and from the Redwood City Costco Gasoline facility are internal <br /> capture trips. Internal capture trips account for those members who patronize both the warehouse <br /> and the gasoline pumps during a single visit to the Costco site. As such, although they account for a <br /> trip to both the warehouse and the fuel station, they only account for one overall vehicle trip to the <br /> site and on the surrounding transportation system. <br /> Kittelson&Associates,Inc. Boise,Idaho <br />