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Subject
- Transportation[remove]9
- National Highway System4
- Roads4
- Passenger trains3
- Transportation corridors3
- Highways2
- Railroads2
- Airports1
- Cable cars (Streetcars)1
- Channels1
- Environment1
- Freight and freightage1
- Hazardous substances1
- Inland Waters1
- Intracoastal waterways1
- Local transit1
- Monorails1
- Rivers1
- Runways (Aeronautics)1
- Shipping1