Since it was the executive branch who did it, it was not an investment but a power grab. And the highway trust fund is an insolvent Ponzi scheme just like SS and Medicare; has been for decades. No, what I’m saying is that the private sector could have done it instead, not that it shouldn’t have been built.
Then why didn’t they? I’ve never read of private companies chomping at the bit to build interstates in the 50’s. And you’d enjoy paying a toll every time you got on one?