TED
Elon Musk said he thinks tunnels could help relieve traffic congestion by giving cars an alternate route to cut across cities.
The Tesla and SpaceX CEO revealed in April his plan for the Boring Company, a new venture that is exploring a way to cut tunneling costs in order to relieve traffic congestion on roads and highways.
Details on Musk's exact plan and its feasibility are still scarce, but here's what we know so far: