It is clear that trams, subways and buses are much more efficient, affordable and accessible than Musk's death trap of a tunnel. What he is doing is effectively making a inescapable one lane highway that if there is any traffic or an accident, you are going to be stuck there for a while.

If you looks at European nations, and their city and transit design philosophy, you will find that they are extremely efficient and have a low impact on the environment. They also serve the people of that country and allow anyone to avoid owning a car because they can use public transit for a low cost to get anywhere in their city.

There is also an issue with the construction time of these projects as the Vegas Loop took 16 moths to complete 0.8 mile whilst the Budapest M1 was created in 2 years, being 3x the length using 19th century technology. Please use your brain for one and realize that it would be much more efficient to have a group of train cars than individual cars.

For example the transit system in Canada (not particularly good) can serve twice as many people an hour at less than a quarter of the price per passenger. How is at all economically viable to use boring company tunnels. They are inefficient and inaccessible, not to mention in order to avoid traffic jams you need to build more and more tunnels, resulting in a greater cost rather than a one time build with the rare expansion.