Displaced threshold

A displaced threshold may also be introduced as a noise mitigation measure for the communities overflown on approach, or if a beginning section of the runway is no longer able to sustain the continuous impact from landing aircraft.

Departing aircraft are permitted to use the section of the runway behind a displaced threshold for takeoffs or landing rollouts from the opposite direction even if the reason for the displacement is lowered pavement resistance, because those aircraft are not impacting the runway with the force of a landing aircraft.

[2] A portion of the runway behind a displaced threshold has three markings:[1] Runway 29L at Indira Gandhi International Airport, in Delhi, India, has a displaced threshold of 1,460 m (4,790 ft) from the physical beginning of the pavement.

This is because aircraft coming in to land need to avoid the Shiv statue, which is located near runway 29L.

[5][6] Runway 22R at John F. Kennedy International Airport has a displaced threshold due to noise abatement.

The displaced threshold is the wide white line across the runway, indicated by white arrows leading up to it. The area behind a displaced threshold can be used for taxiing and taking off in either direction, as well as for landings from the opposite direction.