fail-safe

One significant solution implemented as a fail-safe for Level 4 automated vehicles is the concept of remote driving.

And because airplanes are packed with fail-safes, there are times when a flight with a malfunctioning system can safely proceed simply by relying on one or more backups instead.

This is a fail-safe scenario but the converse "wrong side" failures -- when the signal goes from red to green -- are much more hazardous.

However, discussions of fall-backs and fail-safes have not been welcome in the Wales camp while the possibility of automatic qualification remains.

"These memory immune cells with latent suppressive properties act as a fail-safe mechanism in addition to the protection from traditional memory suppressive T cells."