The free market of WW2 paid for the interstate highway system? Every heavy industry was commandeered by the US government and strict salary controls were implemented by the government. Households had strict quotas for what they were allowed to purchase.

Or before that? When the civilian conservation corps employed huge amounts of Americans to build Mount Rushmore and the Hoover Dam?

The decades immediately leading up to the construction of the interstate highway USA was one of the least free our market has ever been.