The other day I was in Ghent cruising my folding bike in the Veldstraat. Although I have experience with rather extreem MTB tracks, on some sections these cobble stones were a bit to much. So I decided to ride on the side of the pavement (without obstructing pedestrians) the avoid the worst cobble stones. At one point a very friendly police man reminded my I had to use the road. Completely correct, but easier said then done on small wheels.