Parking lots would make more sense than highways.
Off-topic, but the F-35 VTOL design is amusing to me in that it was designed by Russia, but they never made more than a prototype and sold the tech to the US where we've now used it to make planes to take on Russia.
And it might just provide better cover. Western europe has hundreds of places like this. The enemy has to work out which building you are using in a group of fifty other non-descript buildings.
In any case, highways make much more sense logistically and operationally.