The Corso Regina Margherita underpass is a project whose principal aim was that of facilitating movement in the area around the Porta Palazzo market.
The structure of the underpass, some 800 m long overall (with 400 m covered) has made it possible to by-pass the crucial node of Piazza della Repubblica, leaving the local traffic on the perimeter of the piazza itself and thereby rendering the entire area much less congested.
The underpass was made using open digging with the aid of lateral hoardings.
The tunnel was made using prefabricated elements. The tunnel is equipped with a ventilation system and emergency exit. Road signs with varying messages have also been set up.
The underpass project is part of the general requalification of the entire area of Porta Palazzo and Borgo Dora which aims at the tangible rebirth of the district.

Work started: December 1998
Work ended: October 2000
The overall investment for the work was Lit. 18,376,000,000, including the work involved in shifting all the subservices (drains, gas pipes, tram tracks, traffic lights and lighting cables) together with all the finishing works.

Design: City of Turin - Mobility Division and Environment Division
Execution: City of Turin - Projects Division
Entities involved: AEM - ATM - Italgas - Enel - AAM.