Table of Contents

Roads and Bridges by Purpose ................................................................................................................... 2-11
System Characteristics ........................................................................................................................ 2-14
Highway Travel by Functional Classification ....................................................................................... 2-16
Bridges by Functional Classification .................................................................................................... 2-19
NHS by Functional Classification ......................................................................................................... 2-19
Transit System Characteristics .............................................................................................................................. 2-21
System History ........................................................................................................................................... 2-21
System Infrastructure ................................................................................................................................ 2-22
Urban Transit Agencies ....................................................................................................................... 2-22
Transit Fleet ........................................................................................................................................ 2-26
Track, Stations, and Maintenance Facilities ........................................................................................ 2-27
Rural Transit Systems (Section 5311 Providers) ........................................................................................ 2-28
Transit System Characteristics for Americans with Disabilities and the Elderly ........................................ 2-29
Transit System Characteristics: Alternative Fuel Vehicles ......................................................................... 2-31
Chapter 3: System Conditions .................................................................................................................... 3-1
Highway System Conditions.................................................................................................................................... 3-2
Data Sources ................................................................................................................................................ 3-2
Summary of Current Highway and Bridge Conditions ................................................................................. 3-3
Condition of Pavements on Federal-aid Highways ............................................................................... 3-3
Condition of Bridges – Systemwide ...................................................................................................... 3-5
Trends in Pavement Ride Quality ................................................................................................................. 3-5
Pavement Ride Quality on the National Highway System .................................................................... 3-6
Pavement Ride Quality by Functional Classification ............................................................................. 3-7
Trends in Bridge Structural Deficiencies ...................................................................................................... 3-9
Structurally Deficient Bridges by Owner ............................................................................................. 3-10
Structurally Deficient Bridges on the National Highway System ........................................................ 3-11
Structurally Deficient Bridges on the STRAHNET ................................................................................ 3-12
Structurally Deficient Bridges by Functional Classification ................................................................. 3-12
Structurally Deficient Bridges by Age .................................................................................................. 3-13
Geometric Design Standards ...................................................................................................................... 3-14
Roadway Alignment ............................................................................................................................ 3-15
Lane Width .......................................................................................................................................... 3-15
Functionally Obsolete Bridges ............................................................................................................ 3-16
Factors Affecting Pavement and Bridge Performance ............................................................................... 3-19
Implications of Pavement and Bridge Conditions for Highway Users ........................................................ 3-20
Strategies to Achieve State of Good Repair ............................................................................................... 3-20
Transit System Conditions .................................................................................................................................... 3-23
The Replacement Value of U.S. Transit Assets ........................................................................................... 3-25
Bus Vehicles (Urban Areas) ........................................................................................................................ 3-25
Other Bus Assets (Urban Areas) ................................................................................................................. 3-28
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