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The HRBT expansion project will widen the I-64 corridor and is partially above land. Approximately ten miles of interstate will be transformed from four lanes to eight lanes, with significant tunneling operations at its core. The project will introduce two new tunnels under the main navigation channel, each approximately 1.5 miles long, effectively connecting two new artificial islands and expanding the existing infrastructure by an additional 15 acres.
As part of the project, new truss bridges will be constructed to the north and south of the tunnels, with westbound traffic utilizing the existing tunnels and eastbound traffic flowing through the new tunnels.