"This tunnel will create a vital transportation link that will improve safety and reduce traffic congestion in the Miami area," Secretary LaHood said.
"It will also save money for millions of drivers because they will be spending less time on congested roads."
The tunnel will serve as a direct connector to and from the Port of Miami. As a result, this tunnel will remove thousands of commercial trucks and cruise line buses from local streets, improving traffic flow and safety for vehicles and pedestrians in Miami's busy city centre.