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Chapter 4 Existing and Future Conditions with Project This chapter details the likely trip generation of the Project and assigns those trips to the street system to measure the potential impacts of the Project on the existing streets. PROJECT TRIP GENERATION Table 6 shows the potential trip generation estimates for the proposed car wash, which were analyzed using Trip Generation, 9th Edition methodology, the primary source of trip generation information used by traffic engineers in Southern California. The daily and morning peak hour rate was not available for the automated car wash and, therefore, empirical rates were used for the daily and morning peak hour based upon discussion with the Project developer. As stated in Chapter 1, the Project developer estimates that the automated car wash could process up to 500 vehicles per day, which would result in 500 daily inbound and 500 outbound trips1. Using the ratio of daily to morning peak hour of generator rate of a self-service car wash (ITE Land Use Code 947), the Project would result in 74 morning peak hour trips per hour (37 vehicles per hour into the site and 37 vehicles per hour leaving the site). Based on the Trip Generation, 9th Edition estimate, the 4,995 sf of automated car wash is anticipated to generate 71 trips in the afternoon peak hour (36 vehicles per hour into the site and 35 vehicles per hour leaving the site). It should be noted that the Trip Generation, 9th Edition estimate for car washes is based on a limited sample size (one site) and ITE warns that caution should be used when applying this trip generation rate based on such a small sample size. It is unlikely that the car wash would operate at its maximum capacity during the morning peak hour because most commuters do not stop for a car wash on their way to work. However, the 1 The Project estimated daily trips are higher than the observed 307 daily inbound/outbound trips at Bristol Speedwash in Santa Ana. 201-81