|
Topic |
Coverage of existing statistics |
Major gaps in existing statistics |
Why the gaps matter |
Extent of and geographic access to
the transportation system |
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Multiple versions of the highway and rail networks.
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Detailed representation of the waterway network.
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Intermodal passenger connectivity database.
|
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Piecemeal representation of intercity and transit bus service coverage.
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Little data on social service and non-profit transportation coverage.
|
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Identify localities that are isolated from economic opportunities, so- cial services, and upward mobility.
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Identify portions of the transporta- tion network that are vulnerable to disruption.
|
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Vehicle, aircraft, train, and vessel volumes |
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Number of vehicles on highway segments.
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Number of aircraft by airport; number of car-loadings by rail segment; number of vessels by port and waterway.
|
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Inconsistent differentiation among types of highway ve- hicles (car, bus, truck).
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Pipeline volumes by segment.
|
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Different vehicle types have very different consequences for traffic flow and congestion, pavement and bridge wear, exposure to safety risks, and air quality.
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Pipeline volumes affect markets of competing modes and expo- sure to safety risks.
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Condition and performance |
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Condition and reliability of highways by segment, transit by property, and inland waterways by facility.
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Reliability of commercial aviation by flight and airport and by causes of delay.
|
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Condition and reliability of freight railroads.
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Non-comparable throughput data among ports.
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Condition of urban bus and rail transit maintenance facilities, and rail transit infrastructure.
|
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Identify bottlenecks, vulner- abilities to disruption, and other potential losses of efficiency in moving freight and passengers to guide investments in transporta- tion facilities and rolling stock.
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