The passenger information Variable Message Sign (VMS) in this standard is defined as the non-interactive dynamic man machine interface between a Vehicle Scheduling and Control System, usually including an Automatic Vehicle Monitoring (AVM) system, and the passenger at a stop point or other location. This interface is basically visual. It may also incorporate an audio communicator to give audio information on demand for visually impaired users.
This standard covers information content, presentation and location.
The audio information presentation is not part of this standard. The standard does not cover interactive information devices and does not specify display technology. The VMS receives the necessary information through transmission means that are not defined in this standard.