Guide for the Preservation of Highway Tunnel Systems (2015) / Chapter Skim
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1 1.1 Why Tunnel Preservation? 1.1.1 Background Highway tunnels play an important role in our nation's transportation network, providing access through difficult terrain, below waterways, and under other structures.
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2 Guide for the Preservation of Highway Tunnel Systems condition; and extend their lives. Tunnel preservation may also include preventive maintenance, cyclical preventive maintenance (activities on a predetermined interval)
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Introduction to the Guide 3 • Take a network view: A holistic view that considers the entire transportation network as a whole is dependent upon its parts, and, in order to perform, each part needs other parts to function effectively. For example, in an overall highway system that includes tunnels, the performance of both highways and tunnels must be considered for the overall system to function as intended.
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4 Guide for the Preservation of Highway Tunnel Systems identification of LOS priorities with respect to tunnels is a requirement for the tunnel preservation prioritization. • The agency establishes specific performance measures for its transportation system elements based on each LOS to monitor progress in meeting each LOS.
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Introduction to the Guide 5 as well as the potential savings, such as energy savings resulting from the use of energy-efficient equipment. The average daily traffic (ADT)
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6 Guide for the Preservation of Highway Tunnel Systems have overall goals and objectives, also known as LOSs, defined for maintaining and improving their transportation assets. In the absence of established LOSs, the transportation agency must establish them for its overall transportation network, of which tunnels are a part.
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Introduction to the Guide 7 • Each agency has its own unique set of circumstances -- budget limitations, the ability to close the tunnel to perform the work, and so forth -- that affect the final prioritization. For this reason, the tunnel owner has the ability to adjust the final prioritization to suit agency needs.
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