20 cars, 90 passengers, 5 bays. 80 seconds on the clock.
90 waiting
You have 80 seconds, starting at your first tap. A bump costs 3 seconds.
Call the cars to the stop in this order: 13, 3, 12, 18, 1, 4, 2, 19, 7, 5, 10, 8, 11, 15, 9, 14, 16, 20, 17, 6.