road runway

A road runway or road base or highway airstrip (US), is a section of an automotive public road, highway, motorway, or similar, that is specially built (or adapted) to act as a runway for (primarily) military aircraft, and to serve as an emergency or auxiliary military airbase. These road runways allow military aircraft to continue operating even if the runway at their respective airbases (some of the most high-priority targets in any war) are degraded, damaged, or destroyed.
TLDR: Road turned into or at least being used as a makeshift runway.