In the city of Winchester, VMS signs were being installed in NAL Retention Sockets to simplify the initial installation. An RS168 duckfoot bend was chosen as the swivel bases can rotate a full 360 degrees, allowing multi-directional cabling.
The system enables the installation of the VMS column using only a key and spanner. For security a specialist key is used to open the socket side chamber allowing access to the retention bolt. With the column positioned inside the socket this bolt is simply tightened with a spanner, firmly locking the column in place. Once secured the side chamber is re-established and locked.
By utilising the Retention Socket system the VMS sign is fully demountable, making future maintenance a quick and easy process. Should the column become damaged in a vehicular collision the use of a Retention Socket eliminates the traditional procedure of costly and disruptive excavations.