A liquid crystal device comprises a pair of substrates 2a and 2b, liquid crystal L held between the substrates 2a and 2b, and an IC 13 mounted on an overhang section 2c of the substrate 2a. The tray comprises a central portion. In one approach, traffic data regarding major roads are broadcast to vehicles first, followed by traffic data regarding medium roads, while traffic data regarding minor roads are either broadcast last or not at all, depending on the traffic information handling capacities of the vehicles and the traffic information system in general.