This map of South pasadena shows the 4-mile gap in a critical north-south route for cargo coming to and from the ports of LA and Long Beach.
On Thursday, the board of the Metropolitan Transportation Authority is to consider whether to approve a study that would examine different project alternatives and their environmental impacts [to close the gap in Interstate 710]. … A 2006 study showed it was feasible from a geological standpoint to close the 710 gap via a tunnel. If the MTA board opts to proceed, the agency would study a wide range of alternatives including tunnels, improvement of surface streets or the originally planned surface freeway.