Abstract: A locking device used to secure a ladder to a ladder rack or roof rack on a vehicle while being transported. Its main purpose is to help protect a ladder from theft, cross-winds and accidents while being transported comprising a screw member (10) which is threaded at one end (12) and has a curvature at opposite end (14) whereby the screw member (10) is hooked under the ladder rack or roof rack and interlocked with crossbar (22) and handle(16) to secure ladder, the screw member (10) is of a predetermined diameter and length. The crossbar (22) having four equal sides and four right angles comprising a commercial form of rigid material, and having a plurality of holes for an interlocking method for securing the handle (16) to the crossbar (22) and screw member (10). The handle (16) comprising a predetermined diameter center hole (18) and an internal screw thread within the center hole (18) for receiving the screw member (10).