Belbus (B)

When you are traveling in Belgium, it is a good idea to familiarize yourself with the public transport system. What if you're stuck in a small town, with no train station nearby? What transportation should you use? You can always use the bus, but if that's not around, then there is a second choice, one that is cheaper than taking the cab. The Belbus! The Belbus is a bus that drives per reservation, and it serves people in sparsely populated areas. It doesn't have a fixed route or schedule, and stops only at the bus stops of the Lijn (buses in Flanders).

http://www.wikihow.com/Book-the-Belbus-in-Belgium

You can take the bus, even in thinly populated areas. In order to offer cost efficient public transportation, we use dial-a-bus. Dial-a-bus only rides upon request. Dial-a-bus does not have a fixed route or timetable. It is not a taxi: dial-a-bus only stops at De Lijn stops that were requested in advance via the dial-a-bus switchboard.

Currently there are more than 120 dial-a-bus areas in Flanders.

http://www.delijn.be/en/over/aanbod/belbus.htm?ComponentId=217&SourcePageId=348