At our local gas station cars arrive approxiamtely once every 1.5 minutes, but with poisson distribution. The gas station has very limited parking space for waiting cars.
Cars arriving when the station is full are unable to enter and leave in search of another station.
Filling up a car with gas takes approximately 1.35 minutes. Each client car that left the station unserviced cause a loss of reputation to the station. 3 parking spaces. 5 parking spaces. In order to view the results without having to wait to long, lets increase the scale of the problem 60 times.