It hardly seems like the Flemish government are going to create an app that's a serious competitor to Google Maps etc. Even just reaching something reasonably functional for driving directions would be an awful lot of work.
There are some good open-source apps for driving directions. The big problem with those apps is often the lack of a source for live traffic information, but the government probably has something for that already, so hooking that up into an open-source app should be quite effective. Shouldn't be too hard to advertise an app if it means you see more green lights on your journey.
