# The Saturation Flow Rate

1.The saturation flow rate for a pretimed signalized intersection approach is 1800 veh/h. The cycle length is 80 seconds. It is known that the arrival rate during the effective green is twice the arrival rate during the effective red. During one cycle, there are 2 vehicles in the queue at the beginning of the cycle (the beginning of the effective red) and there are 8 vehicles in the queue at the end of the effective red (the beginning of the effective green). If the queue clears exactly at the end of the effective green and D/D/1 queuing applies, determine the total vehicle delay on the approach in the cycle (in veh-s).

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2. An approach to a signalized intersection has a saturation flow rate of 1800 veh/h. At the beginning of an effective red, there are 6 vehicles in the queue and vehicles arrive at 900 veh/h. The signal has a 60-second cycle with 25 seconds of effective red. What is the total vehicle delay on the approach after one cycle (assume D/D/1 queuing)?