MOS meaning

MOS is an acronym for monitoring Outstation: a field device in intelligent transport systems (ITS) and other SCADA‑managed infrastructure that monitors asset status (for example, variable message signs, CCTV and tunnel plant) and sends data and alarms to a control centre, often also enabling remote control. The term is descriptive and technical, used in highways, tunnel and other public works and operations contracts and specifications across England and Wales, Scotland, Northern Ireland and Ireland. It is not defined in legislation or case law; its meaning should be taken from the relevant specification or scope. Legal significance includes allocating design, supply, installation and commissioning; performance and availability requirements; maintenance and replacement; handback; cyber security and safety compliance; data protection where personal data (for example, CCTV images) is processed; title, risk and warranties; and interfaces with communications and power. Works and access may require wayleaves, easements or traffic management permits. Usage is broadly consistent across the UK and Ireland, though equivalent terms (outstation, remote outstation, remote telemetry unit) may appear. Contracts should define Monitoring Outstation (MOS) and distinguish it from the central control system and the roadside devices it supervises.