ITS On The M1
While some other sections of Irish motorways also feature Variable-message signs, the M1 is the only one connected to an Intelligent transportation system providing real-time journey time information for motorists. The system works by recognising vehicle number plates at intervals along the motorway, and uses this information to calculate average vehicle speeds and hence travel times. Northbound, VMSs near Malahide and Balbriggan provide information on the journey times to the Drogheda (J7) and Dundalk (J16) exits. Similar signs southbound provide information on the travel time to Dublin airport and the Dublin port tunnel.
Read more about this topic: M1 Motorway (Republic Of Ireland)