It's not just cars, now is it? Thirty percent of all freight in NA is carried by truck (compared to 70% in Europe). If we focus in on "last mile" it's near 100%. Also, depending on jurisdiction, the gas tax and licensing fees pay for the road infrastructure. If you don't have a car, you're not contributing.

That's why the costs of road infrastructure were initially tolerated, with personal use secondary. Once people got used to the freedom, and car ownership exploded, road works were emphasized.

Having said that, HSR, does nothing for commute times. That's the domain of buses, light rail, trams, subways and conventional rail. All of which have been neglected, but that's a separate issue. HSR is also energy intensive, as energy required to move an object is proportional to the square of velocity.

The tracks have to be pretty much prefect to maintain stability. Given the amount of frost heaving we get, that 3x the cost of conventional rail might be extremely optimistic. Sections of track in Sweden, for instance, have been reduced from 200km/h, very much the lower limit of what constitutes HSR, to 130km/h, not far off the current speeds here on some sections, due to track deterioration.

I would like to see all rail infrastructure owned by a crown corp, with private rail companies competing with their own rolling stock, both freight and passenger. They'd pay the crown corp for track/station use, with those funds paying for maintenance and upgrades. That move would greatly improve the rail situation here.

As far as HSR, it an expensive boondoggle waiting to happen.