Highway Tunnel Control Systems 

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SSL are leaders in providing Tunnel Systems and have provided Traffic Control and Monitoring equipment for many UK Tunnels.

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Since the late 80's SSL has provided equipment for many Tunnel Systems (Bryn Glas Tunnel), in the next decade came Fore Street, George Green and Green Man Tunnels and more recently Tamar Bridge / Saltash Tunnel, Southwick Tunnel, Bell Common, Holmesdale, Hatfield and Hindhead Tunnels.

Tunnels are the most hazardous part of the road network and as such a specialist, complex area that involves reliably integrating a large range of inputs and associated operations and outputs in response to this information.

The inputs include those from air quality, smoke/fire detection, flood and sump level sensors, loop or video based detection of vehicles, video based detection of animals and pedestrians.

It is necessary to control devices including fans, lighting levels, motorway signalling devices including Wigwags, Lane Studs, Lane Segregation Signals, Traffic Lights and Barriers.

SSL are able to offer fully integrated Tunnel Control Systems including all associated low voltage tunnel monitoring and control plant SCADA equipment, CCTV, Traffic Detection Equipment and communications infrastructure.

SSL has an in-depth technical understanding of tunnel requirements and furthermore excellent knowledge and capability in delivering to the IEC61508 safety standard which Tunnel Sign Controllers must meet. SSL are experienced in and able to provide a full IEC61508 safety analysis including SIL derivation and safety case.

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