This issue, to me, is hugely concerning. Why did one mile of the bay bridge cost as much to build as funding NASA for 6 years?
https://en.wikipedia.org/wiki/List_of_automotive_superlative...
Federal interstate MINIMUM construction standard is to assume 105500 pound semi trucks.
https://en.wikipedia.org/wiki/Federal_Bridge_Gross_Weight_Fo...
IF you could get the big trucks off the roads, maybe use very small pickup sized autonomous self driving trucks running on and 3 inch thick concrete like a driveway, THEN $600K would probably be achievable.
There are also correction factors that a SUV probably never exceeds 5 MPH on a driveway and usually doesn't park there and frankly most cheap driveways would be destroyed by a vehicle that heavy anyway, whereas the road has to survive 24x7 service at 75 MPH. The pounding the road takes at 75 MPH at 105500 pounds must simply be incredible.
[0] Link to link: http://www.vabike.org/vehicle-weight-and-road-damage/
I'd be interested to know more about the breakdown, and I'd bet at least some municipalities are required to share it. A well trained road crew is likely pretty expensive, and as others noted, there's a lot more to a road than a driveway. Most driveways I've seen are largely cement planks, whereas a road is layers of differing materials to ensure frequent use doesn't destroy it too quickly.
As for bridges. Eugh. I dunno. Those things are often crazy expensive. I wouldn't be surprised though, since that bridge is rather large and suffers a lot more wear and tear than NASA. I mean, they just need to punch a few one-time use rockets into space, but that bridge has to deal with thousands of semis. Space is a nasty place, but I'm betting thousands of trucks barreling over is harder to deal with year in and out.
The same goes for asphalt, if that's what they're using. It'll be cheaper because it's not designed to last as long, but the scaling factors hold.
At the very minimum, load and wear patterns are vastly different. Drainage probably looks quite different also.
I wouldn't be surprised if it requires a fundamentally different approach. Would you?
I don't know either. But if it turns out that paving your driveway to the same standard would cost $100,000 the scaling looks much better.
It is generally good to be wary of things that are superficially similar being used as proxies for one another...