The N25 is a national and provincial road in Belgium, connecting Leuven in Flemish Brabant with Nivelles in Walloon Brabant via Wavre and Ottignies-Louvain-la-Neuve. Portions of it are built to expressway standards between Louvain-la-Neuve and Nivelles.[1]
As part of the Brabant tertiary national roads network, the N25 serves as a vital north–south corridor linking several university and commuter towns. Traffic volumes peaked in 2008–2010, with reporting showing increasing car usage along the N25 corridor.[1]
Route
The N25 begins in Leuven, heading southeast through Oud-Heverlee and Bierbeek, then continues east into Walloon Brabant via Beauvechain and Grez-Doiceau. It passes through Wavre and Ottignies–Louvain-la-Neuve before reaching Mont-Saint-Guibert. From here, it transitions into a 2×2 expressway, with grade-separated interchanges at Court-Saint-Étienne, Genappe, and other key junctions.
History
The expressway section was constructed in stages: initial link from N4 to N275 (pre-1988), followed by extensions in 1988 (to N275–N5), 1995 (to N237), and completion in 2007 with the final link to R24 at Nivelles. The last segment was inaugurated by then-Minister Michel Daerden.
Major junctions
Leuven – connection to regional roads near city center
SOFICO / Walloon government – structuring network map
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