Before revision: A variable- (also changeable-, electronic-, or dynamic-) message sign , often abbreviated VMS , CMS, or DMS, and in the UK known as a matrix sign, is an electronic traffic sign often used on roadways to give travelers information about special events.
After revision: or message board, VMBA variable- (also changeable-, electronic-, or dynamic-) message sign , often abbreviated VMS , CMS, or DMS, and in the UK known as a matrix sign, is an electronic traffic sign often used on roadways to give travelers information about special events.