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Varadero <br />Traffic Study <br /> <br />Page 24 <br />The queuing analysis for each tower used the single-channel waiting line model with Poisson <br />arrivals and exponential service times. The analysis is based on the coefficient of utilization (ρ) <br />which is the ratio of the average arrival rate of vehicles to the average service rate. <br /> <br /> = <br /> <br />The average service rate corresponds to the time it will take a valet parking attendant to park or <br />retrieve a vehicle. If the coefficient of utilization is greater than 1, then the calculation will yield <br />an infinite queue length. <br /> <br />The required queue storage (M) is determined using the following equation: <br /> <br /> = <br />ln > <br /> − ln ln − 1 <br /> <br />In this equation, P(x > M) is set at 5% to yield a 95% confidence that the queue will not back-up <br />onto the adjacent street. <br /> <br />Parking for the development will be all valet except for 85 assigned residential parking spaces that <br />will be self parking. The self parking represents 11% of the parking spaces provided for the <br />residential component therefore a deduction was taken to account for the project trips (residential <br />only) not using valet. An overall 10% deduction was applied to account for transit/ pedestrian <br />trips. Valet will use tandem, double mechanical, and triple mechanical parking located on the <br />basement level. <br /> <br />Since the driving distance differs for valet for inbound/outbound access, a weighted average of the <br />inbound and outbound driving time was used. The weighted average was based on the trip <br />generation in/out distribution, which was 62% IN and 38% OUT.