The plan calls for one dedicated lane for electric buses on each level.
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The project would link autoroutes 20 and 973 with an exit to the autoroute Dufferin-Montmorency.
Premier François Legault, Deputy Premier Geneviève Guilbault and Transport Minister François Bonnardel presented the tunnel as part of a broad transportation plan for the Quebec City area, a plan they dubbed the Réseau express de la Capitale (REC).
The REC also includes the much-anticipated Quebec City tramway.
The provincial government's preliminary estimate puts the cost of the tunnel between $6 billion and $7 billion.