Subject
Federal aid to transportation
7
Transportation and state
6
Infrastructure (Economics)
5
Infrastructure (Economics) Finance
5
Shipbuilding industry
4
Transportation Capital investments
4
Truck drivers Workload
4
Management
3
Rules and practice
3
Shipping
3
Trucking Safety measures
3
Appropriations and expenditures
2
Evaluation
2
Fatigue
2
Freight and freightage
2
Freight and freightage Government policy
2
Harbors Economic aspects
2
Harbors Management
2
Pipelines Safety measures Evaluation
2
Pipelines Safety regulations
2
Public-private sector cooperation
2
Railroads Finance
2
Railroads Passenger traffic Finance
2
Railroads Passenger traffic Management
2
Shipping Government policy
2
Terrorism Prevention
2
Traffic safety
2
Transportation Security measures
2
Transportation Technological innovations
2
Truck accidents Prevention
2
Truck driving Safety measures
2
Administrative procedure Decision making
1
Automobiles Safety appliances Technological innovations
1
Automobiles Safety measures
1
Automobiles Safety regulations
1
Big data Management
1
Business logistics Economic aspects
1
Containerization
1
Containerization Government policy
1
Electric power failures Prevention
1
Electric railroads Equipment and supplies
1
Electric railroads Maintenance and repair
1
Embedded Internet devices
1
Freight and freightage Economic aspects
1
Gas pipelines Safety measures
1
Grants-in-aid
1
Harbors Maintenance and repair Finance
1
Harbors Security measures
1
Hazardous substances Transportation Safety measures
1
Hazardous substances Transportation States
1
more ...