Definition
A trapezoidal area on the ground at each end of a runway, established by the FAA to enhance the safety of people and property on the ground by keeping it clear of incompatible objects and activities. The RPZ lies beyond the runway end and underlies the approach and departure paths where aircraft are at low altitude.
Plain English
A protected piece of ground just off each end of a runway. Airports keep this area as clear as possible so that if something goes wrong on takeoff or landing, there is nothing important in the way.
Context Anchor
You are most likely to see RPZ in airport planning, runway safety, land-use, or airport design discussions, rather than as a normal cockpit control or radio term.
Derivation
Straightforward: it is a zone (an area) that protects the runway environment — specifically, the people and property on the ground beneath the most critical phases of arrival and departure.
Why Pilots Care
Awareness of the RPZ helps pilots understand airport design limits and why certain areas near runways remain undeveloped, supporting safer takeoff and landing planning.
Grounding Statement
Picture the ground just beyond a runway end being kept as clear and controlled as practical because that is the area most exposed if an aircraft comes up short or cannot stop in time.
Intuition Check
Do not think of an RPZ as protected airspace or as a place pilots navigate to. It is a ground safety area near a runway end, mainly used in airport design and land-use planning.
Example Sentence 1
The airport master plan called for relocating a road that passed through the RPZ at the end of Runway 27.
Example Sentence 2
Construction inside the RPZ is limited to reduce hazards during a possible runway overrun.