Of course. Roads are great. But they have drawbacks:
1) two dimensional, meaning you have to deconflict intersections with stop signs, stop lights, low-speed traffic circles, or huge cloverleafs. Also means that adding more road capacity directly eats into land use. This drives density down, increasing travel times overall. It also is a huge barrier to foot traffic, bicycles (for high speed roads), and wildlife.
2) Weather. Inclement weather limits when you can drive on roads and how fast as well as reducing safety dramatically and reduces capacity.
3) Speeds. Can't safely go 125mph on a road unless you have a LOT of space to accelerate. Even on the autobahn, this is pretty dangerous.
Tunnels are 3D and do not take up space from other things, deconflicting the tension between single-occupancy vehicles and buses (and other modes of public transport). And small tunnels (gas, water main, electrical and telecomm conduit, storm sewer, and sanitary sewer) are already ubiquitous, going under basically everyone's property and in multiple levels. This is especially so in large cities, when the size of those existing tunnels can approach what Musk envisions.
If you could somehow dramatically lower the cost of tunneling (and tunneling in particular, not trench-and-covering, which disturbs the surface), then you could do transport much more efficiently.
New York City shows what a great subway system is like and how tunneling enables efficient transport in spite of huge densities. But it's 100 years old, and for whatever reason (labor costs, safety, etc) we simply could not afford to build another system like it nowadays.
2) Weather. Inclement weather limits when you can drive on roads and how fast as well as reducing safety dramatically and reduces capacity.
3) Speeds. Can't safely go 125mph on a road unless you have a LOT of space to accelerate. Even on the autobahn, this is pretty dangerous.
Tunnels are 3D and do not take up space from other things, deconflicting the tension between single-occupancy vehicles and buses (and other modes of public transport). And small tunnels (gas, water main, electrical and telecomm conduit, storm sewer, and sanitary sewer) are already ubiquitous, going under basically everyone's property and in multiple levels. This is especially so in large cities, when the size of those existing tunnels can approach what Musk envisions.
If you could somehow dramatically lower the cost of tunneling (and tunneling in particular, not trench-and-covering, which disturbs the surface), then you could do transport much more efficiently.
New York City shows what a great subway system is like and how tunneling enables efficient transport in spite of huge densities. But it's 100 years old, and for whatever reason (labor costs, safety, etc) we simply could not afford to build another system like it nowadays.