A bit of history: The interstate highway system was designed in many areas to serve as emergency airstrips in case of what looked at the time of nuclear attack from the Soviets.
IIRC, distance between over passes and such was regulated to produce useable runways.
Thanks for the additional insight. I kind of recollect that, but forgot those details.
The Germans used the Autobahns as airstrips and parked their planes and jets under overpasses in the later stages of WW II.If you can’t control the skies over your domestic military bases, you are likely losing and will lose a war.