Those were build all over Europe, east block, or west, the idea was the same. For example, here's a map of Poland, that would be dated 1990:
MapThe triangles are "DOL" (Drogowy Odcinek Lotniczy) - the "highway strips",
officially there were 21 in total, all having straights of more than 2000 meters (6500ft), some reaching 3300m (11000ft), all were build in the same way as typical military airstrip (same design and materials), all able to accept every fighter jet of the east (MiG-31 included), and transport aircraft. Bombers, except for Su-24 would not land here.
There are not many left today though, I use one for winter driving practice - one that is actually not on that map, it's 2400m long, 30m wide, the road uses actually only 800m of the strip, so I have a mile to play with practicing driving on snow and ice

During the cold war scramble take off was something that was practiced religiously, up to the point that very risky maneuvers were incorporated, for example the MiG-23 used as interceptors could evacuate base in less than 5 minutes, and we're talking about 30+ aircraft here, from airbase that had only two runways. Both runways and taxiways would be used for take off, simultaneously, getting all the planes in the air in a matter of seconds, the jets would takeoff in pairs from runways, crossing each other paths by wingspan length... no margin for error.
Believe it or not, the nuclear strike was not a concern
