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Trunk Road Incident Support Service (TRISS)

Transport Scotland provides the Trunk Road Incident Support Service (TRISS) to help deal with incidents on our trunk roads.


TRISS is a patrol service provided by Transport Scotland as part of our ITS (Intelligent Transport System) Action Plan.

It was introduced in May 2005 and has since been extended to cover Scotland’s busiest trunk roads and motorways.

Six TRISS vehicles pro-actively patrol our motorways and trunk roads, dealing with incidents and supporting the emergency services in clearing incidents. 

TRISS is provided by Operating Companies as part of their contract with Transport Scotland.

The service operates seven days a week between the morning and evening peaks. TRISS coverage includes the M8, M73, M74, A725, M80, M77, A720, A1, M9, M90, A92, A823(M) and A985.

Aims and activities

TRISS aims to:

  • Improve journey time reliability by managing and reducing the impact of disruption caused by incidents on motorways and trunk roads
  • Improve safety and security for travellers by early identification and removal of incidents, resulting in a reduction of secondary accidents

Typical activities include:

  • Under Police instruction, make incidents safe by deploying temporary traffic management
  • Relieve congestion and remove hazards to safety by clearance of debris from traffic lanes and hard shoulders
  • Where possible make repairs to damaged parts of our trunk roads
  • Offer assistance to broken down vehicles including assisting in removing broken down vehicles to safe locations

From time to time TRISS is deployed at major sporting and music events to minimise the impact of event related congestion.

If you have any comments on the use of TRISS vehicles, please contact us.

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