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Subject
Transportation
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69
Structure
16
Roads
14
Railroads
13
Traffic density
12
Local transit
9
Traffic flow
8
Trucks
7
Location
6
Trucking
6
Airports
5
Local transit stations
5
Street-railroads
5
Traffic volume
5
Boundaries
4
Coasts
4
Highway planning
4
Highways
4
Oceans
4
Railroad stations
4