Let's talk about IBIS, the Integrated Board Information System.

The IBIS controls the validators and the matrix displays and stops announcements, if any. With version 2 (from buses built in '92), it also displays delays.

You set line and route at the IBIS (sort of the direction of one line) and switch it depending on the location one stop ahead. If line and route have been entered, the IBIS has access to the stored stations in the correct order.

The IBIS is located on the driver's workplace left of the cash desk.