Gibraltar, world’s only airport runway intersecting a road
For decades Taiwan has designed sections of its highways to be converted to military runways in the event of an attack by China. Here's a review with photos of a training exercise a few years ago:The [Taiwan] Air Force sent four types of aircraft to participate in the exercise: a F-16V Fighting Falcon, a Mirage 2000-5 multi-role fighter jet, and Taiwan’s own Indigenous Defense Fighter. The jets took off and landed with weapons onboard—the F-16 carried two Harpoon anti-ship missiles, two AMRAAM medium-range air-to-air missiles, and two AIM-9 Sidewinder short-range air-to-air missiles. The same jet or another jet later landed on the improvised airstrip, minus the two Harpoon missiles.https://www.popularmechanics.com/military/aviation/a27633093...Surely other countries have similar provisions in place, considering some of the first military facilities to be taken out in the event of a surprise attack are military runways.