Wallonia's First Diamond Interchange Opens in Mont-Saint-Guibert

The new road infrastructure aims to ease traffic, enhance safety, and improve mobility across the Brabant Wallon region.

Aerial view of a new highway interchange in Mont-Saint-Guibert, connecting roads N4, N25, and E411/A4, featuring cycling paths and a carpooling parking lot.
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Aerial view of a new highway interchange in Mont-Saint-Guibert, connecting roads N4, N25, and E411/A4, featuring cycling paths and a carpooling parking lot.

Wallonia's very first diamond interchange, connecting roads N4, N25, and E411/A4, was officially inaugurated in Mont-Saint-Guibert on Friday, October 2nd, following three years of construction.

This significant step for local mobility now provides direct connections between the N25 and the E411/A4. The primary goals of this new development are to streamline travel and enhance safety around this major road junction.
Facilities for cyclists have also been improved as part of this project. Additionally, a carpooling parking lot with 145 spaces is now available for users.
Beyond the direct benefits for Mont-Saint-Guibert, this new interchange is expected to alleviate pressure on neighboring interchanges and improve traffic flow throughout the Brabant Wallon region.
The interchange is now fully operational. The final road works will be completed in the coming weeks.
Based on information from the official source: Commune de Mont-Saint-Guibert (02/10/2026)