What do Chevron markings preceding a runway threshold indicate?

Chevron markings preceding a runway threshold are used to signify that the runway is not suitable for landing, takeoff, or taxi. These markings provide crucial visual cues to pilots, indicating that they should avoid using that section of the runway. Typically painted in a pattern of angled lines, chevrons serve to clearly delineate an area that is unserviceable and warns pilots of potential hazards.

The presence of these markings is particularly important for maintaining safety as they help prevent accidents that could occur if a pilot were to mistakenly attempt an operation where the runway is not deemed safe. This visual indicator is part of standard aviation procedures, reinforcing the importance of adhering to runway markings for the safety of both operational and non-operational aircraft.