>They can share existing infrastructure that doesn't require thousands of specialised people to maintain or operate...
Spending on highways and roads was $175 billion in the US in 2016 [0]. They absolutely do require massive numbers of people to maintain them - for example, Caltrans, the California agency that manages the state highway system, has over 18,000 permanent staff.
Spending on highways and roads was $175 billion in the US in 2016 [0]. They absolutely do require massive numbers of people to maintain them - for example, Caltrans, the California agency that manages the state highway system, has over 18,000 permanent staff.
[0] https://www.urban.org/policy-centers/cross-center-initiative...