Spatial content and maps are no longer unusual on the Internet. Public transport operators have realised that the Internet is currently the most powerful medium for the dissemination of up-to-date scheduling and timetabling information. Transportation information is now of vital interest in our daily lives. Journey planning systems are innovative uses of the WWW providing geospatial information about transportation with maps and schematic routing diagrams being used in these systems. Transportation maps are now amongst the most important and influential cartographic works in the world [Thrower]. A public transport journey planning system ptInfo [Mooney] has been developed to allow users to plan journeys on public transport systems. The system returns detailed journey itinerary specifications including interchange points. ptInfo uses digital maps as its principal means of journey specification and user interaction.