Definition
An airport movement-area sign with a white horizontal bar inside a red circle on a red background, used to identify a paved area where aircraft entry is prohibited. It is typically placed at the end of a one-way taxiway or at the boundary of a vehicle roadway that should not be entered by aircraft.
Plain English
A red round sign with a white bar across it, telling pilots they must not taxi into that area.
Context Anchor
Seen on airport surfaces, near taxi routes, service roads, ramps, or closed/restricted access points.
Why Pilots Care
Helps prevent runway incursions by clearly marking locations where entry would create a safety hazard.
Intuition Check
Do not treat it as a suggestion or as a sign meant only for cars. On an airport, a No Entry Sign is a hard stop for aircraft and vehicles unless proper airport authority directs otherwise.
Example Sentence 1
As we approached the intersection, the no entry sign on the right confirmed that taxiway was one-way against us.
Example Sentence 2
During night operations the No Entry Sign was illuminated to prevent unauthorized access to the runway.