K53 Prep

Arrestor bed

Guidance GS501, GS502, GS503, GS504
Where you'll see it
On descents
What it means
To indicate that there is an arrestor bed ahead and to indicate the entrance to such an arrestor bed
What you must do
Should the brakes of your vehicle fail, drive straight into the arrestor bed

Source: Signs manual GS501, GS502, GS503, GS504