21 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: 3, 5, 19, 18, 14, 20, 17, 12, 16, 13, 7, 11, 21, 4, 6, 2, 8, 9, 10, 15, 1.