I've always liked the idea of turning the northbound blackwall tunnel into a combined underground shopping centre/cycle lane/footpath. It's ill-suited to motor vehicles in any case and could be replaced with a new northbound vehicle tunnel.
Idea would be to split the tunnel into two levels with a deck, have the lower right hand lane for cyclists (two way), upper right hand side for pedestrians and the entire left side for shops with frequent stairs/lifts for access between the two levels.
London had this years ago in the form of the Thames Tunnel, however the gloomy gas lighting meant it didn't last long as a pedestrian tunnel. With modern lighting and ventilation I wonder if this is a possiblity.
Idea would be to split the tunnel into two levels with a deck, have the lower right hand lane for cyclists (two way), upper right hand side for pedestrians and the entire left side for shops with frequent stairs/lifts for access between the two levels.
London had this years ago in the form of the Thames Tunnel, however the gloomy gas lighting meant it didn't last long as a pedestrian tunnel. With modern lighting and ventilation I wonder if this is a possiblity.