These displays are generally used to guide the passangers. The display indicates Root No, Destination and the description of root by which the bus goes. One bus will be having two displays, one located on the front and another will be adjustant to the front door. The displays are connected to each other through serial comunication so that the data entry can be done only in one display. The data shall be transferred to other display automatically. The root description can be defined with respect to the root no. So that one can enter the root no only and no need to edit the root description every time.