Of the toll plans, most widely discussed so far is the one Gov. Ned Lamont outlined in his proposed budget, which House Bill No. 7202 suggests should be implemented. The malleable plan calls for no more than 50 electronic toll gantries — or the structures equipped with cameras that read drivers’ plates — to be spread across Interstates 84, 91 and 95 and the Merritt Parkway. Construction on the tolls would begin no earlier than 2022 and would cost $213 million. Once operational, Lamont estimated the tolls would generate about $800 million annually to help the Department of Transportation address Connecticut’s crumbling infrastructure.