Hello,

I travelled the Researchdreef today, but in the other direction of the sign you posted (so didn't see it).

As the same cycling marks as in other Brussels street were painted on the street, I presumed that this was done by the Brussels government authorities. The street also 'looks' like a normal public street, see for expample the street name sign when you enter it.
Maybe 'designated' is a more approriate tag here ?
 
