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,Shot of the Ville-Marie tunnel in Montreal.

Autoroute 720 (or A-720, known as the Ville-Marie Expressway) is a spur route of Autoroute 20. 

Part of this multilane highway runs underground (below-grade) through downtown Montreal. Its western end starts at the Turcot Interchange, a junction with Autoroute 15 and Autoroute 20. Its eastern terminus is at the Jacques Cartier Bridge (Route 134) where the highway merges with Notre-Dame Street.

A-720's tunneled section begins from the west at Rue de la Montagne/Atwater Avenue and remains underground to its current eastern end, except for a short section between Bleury St. and Saint-Laurent St. 

The tunnelled section west of this gap is known as Ville-Marie Tunnel, and the section east of it is known as Viger Tunnel.