Development of Levels of Service for the Interstate Highway System (2010) / Chapter Skim
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Pages 20-28
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20 The proposed template for Interstate LOS assessment is shown in Table 4-1. The template lists all asset classes and elements that are needed to ensure a comprehensive assessment of IHS LOS.
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Asset Class Element Definition Indicators Measure Level of Service Thresholds A B C D F Bridges Deck Condition This element applies to the riding surface of the bridge where live loads are directly applied (NBI Item No.
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22 Asset Class Element Definition Indicators Measure Level of Service Thresholds A B C D F Bridges (continued) over navigable waterways are not considered for the purposes of determining LOS.)
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23 Bridges (continued) Asset Class Element Definition Indicators Measure Level of Service Thresholds A B C D F with a total length of 20 ft or more, including the alignment, settlement, joints, structural condition, scour, and other items associated with culverts, such as wing walls (NBI Item No.
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24 Asset Class Element Definition Indicators Measure Level of Service Thresholds A B C D F Drainage (continued) structures, retention ponds, or waterways.
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25 Asset Class Element Definition Indicators Measure Level of Service Thresholds A B C D F Pavement (continued) Fatigue Cracking (Jointed Concrete Pavement)
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26 Asset Class Element Definition Indicators Measure Level of Service Thresholds A B C D F Roadside (continued) Slopes This element includes roadside front and back slopes, between edge of shoulder and right-ofway line.
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27 Asset Class Element Definition Indicators Measure Level of Service Thresholds A B C D F Traffic Control Devices – Passive (continued) Pavement Markings/ Symbols/ Legends This element includes any pavement markings, other than line striping, such as exit-lane and throughlane arrows, route numbers, and symbols.
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28 Asset Class Element Definition Indicators Measure Level of Service Thresholds A B C D F Mobility (continued) Reliability This item indicated the reliability of travel by estimating the percentage of trips for which a traveler arrives on time, based on an accepted lateness threshold.
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