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Main Types of Signals and Signs

Below are examples of signals and signs (which are all types of VMS) in use on the Highways Agency network.

Signals

Central Reserve Post-mounted Signals (Matrix Signals)

  • Caters for up to 3-lane motorways and major trunk roads
  • Spaced at 3km intervals
  • Limited to display advisory fog warnings, speed restrictions and lane closures with amber flashing warning lanterns

Slip Road Post-mounted Signals

  • Normally situated in pairs at entry slip roads
  • Similar to matrix signals; displays advisory fog warnings, speed restrictions and lane closures with amber flashing lanterns
  • Additional function to display red lanterns to allow mandatory closures of slip roads only

Gantry Mounted Signals

  • Allows flexibility for individual lane signalling (display applies to the lane below each signal)
  • Displays advisory fog warnings, speed restrictions, lane closures and lane diversions
  • Can display red “X” and red flashing lanterns to provide a mandatory “stop” signal
  • Spaced at 1km intervals

Signs (display information using text)

EMS (Enhanced Message Sign)

  • Can be mounted either on cantilever posts or alongside Gantry Mounted Signals
  • Display information about incidents and hazards
  • 2 lines of 12 or 16 characters are used for tactical* messages and 3 lines of 12 or 18 characters are used for strategic* messages.

These legends inform motorists of the reason why the signals have been set.

MS2 (Message Sign Mark 2)

  • Mounted on cantilever posts
  • Display information about incidents, hazards and campaigns
  • Usually an VMS with 2 lines of 12 characters, together with an enhanced matrix indicator (EMI), which is a slightly larger Matrix Signal
  • Now obsolete - replaced with MS3 for new installations

MS3 (Message Sign Mark 3)

  • Mounted on Cantilever Posts only
  • Display information about incidents, hazards, campaigns and restrictions and can include a matrix signal aspect
  • 2 lines of 16 characters or 3 lines of 18 characters

The above signs can be set automatically by Motorway Incident Detection Automated Signalling (MIDAS) or manually by control room staff.