The immersed tube would extend for approximately 360 metres to the south bank of the river (Point B). From the south bank, a further cut and cover section would contain the tunnel for approximately 840 m as far as the tunnel portal (Point C). A new bridge carrying Howard Street will cross the new south tunnel portal.

From the southern portal, highway works would extend a further 400 metres south connecting with the A19 just south of the existing Metro bridge. The existing roundabout would be removed and the A19 would become a through route. The new interchange near Epinay Walk would permit full access to and from the local road network.

A new ventilation shaft would be constructed within the boundaries of the new interchange and the existing ventilation shaft near the southern entrance of the pedestrian and bicycle tunnels will be demolished.