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Another option is to walk or take the bus (351, 352, 358) to the Brusselsesteenweg (the N2) and hitchhike from there (just hitchhike on the bus stop). The N2 goes straight to Brussels.

The best option is however to walk a bit further down the N2 to hitchhike on the entrance to the E314 direction Brussels / Luik. There is place for the cars to stop and there are many cars going to Brussels from there. The waiting time is usually not longer than 20 minutes.