Ladder Bed Lock : A lock that secures an aerial ladder in its bed for road travel; it must be released either manually or mechanically before the ladder can be raised
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}