We are working on a multimodal routing for Austria (also for pedestrians). What I can say till now:
- You need the data: It took at least 4 years and even longer to collect all the necessary walkways, barriers, steps, opening times, streets, railways, bikeways, ferrys, and, and and...and its still going on
- You need a router which can interprete theses graphs and transfers between the different networkings, including all the metainformation (traffic jams on the streets, trains getting late, opening times of a portal to a park)
Our very first prototype was www.anachb.at which does mutlimodal routing in the eastern vienna region of austria. It was released 2009.
In 2013 there will be a new site www.verkehrsauskunft.at which will hopefully provide also an improved pedestrian routing (routing pedestrians over existing walkways only, also respecting safety). At the moment its in internal beta testing, and there is still some work to do.
These projects were also presented at the ITS World Congress which also was held in .... tataaa ... Vienna last year, so the routing theme and ITS in general is experiencing kind of a hype here at the moment