I didn't see it on any of the old maps and photos in the second link, but Stapleton (Denver) Airport had a runway which ran over I-70. I wonder if anyone should mention this to the website.
Scared the hell out of Wife1 and myself as we happened to be coming up (eastbound) on this underpass and this jet zoomed over it.
When the airport closed after DIA opened, we used to have timed trials in SCCA Rocky Mountain Solo racing courses laid out on the tarmac. Both my sons raced their Datsuns 240Z and 280Z there. Finally the whole thing was closed up for development.
Terry