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Road tunnels employ a multitude of functional systems that include a variety of equipment: lighting, ventilation, power supply, fire protection systems such as fixed fire-fighting systems, fire detection systems, communications systems and operational devices, supervisory control and data acquisition, closed circuit television, variable message signs, and radio. Maintenance of these systems is critical to the operation of the tunnel and to the overall roadway network.
NCHRP Synthesis 607: Critical Findings for Tunnel Functional Systems, from TRB's National Cooperative Highway Research Program, documents methods and practices employed by state departments of transportation (DOTs) and how DOTs define critical findings, the specific criteria they employ in identifying critical findings, and the processes they follow to address these systems-related issues.
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