Porte de Hal
Between the western exit of the Halle Gate tunnel and the Anderlecht Gate intersection the N0 designation follows Boulevard du Midi/Zuidlaan, while the counter-clockwise direction (following Boulevard Poincarélaan and Avenue de la Porte de Hal/Hallepoortlaan) has the designation N0a. While between Place de l'Yser/IJzerplein and the Antwerp Gate intersection the N0b designation exists for a short section of Boulevard d'Anvers/Antwerpselaan where the N0 has entered the Rogier tunnel. Finally, the designation N0c was given to a stretch of road connecting the small ring to Rue Belliardstraat at the Trône or Troon tunnel (counter-clockwise only).