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Administration and Management (1382)
Aviation (286)
Bridges and other structures (1313)
Construction (836)
Data and Information Technology (1161)
Design (1256)
Economics (504)
Education and Training (411)
Energy (243)
Environment (708)
Finance (632)
Freight Transportation (449)
Geotechnology (384)
Highways (5423)
History (55)
Hydraulics and Hydrology (226)
Law (27)
Maintenance and Preservation (942)
Marine Transportation (123)
Materials (1749)
Motor Carriers (129)
Operations and Traffic Management (1724)
Passenger Transportation (180)
Pavements (1244)
Pedestrians and Bicyclists (167)
Pipelines (25)
Planning and Forecasting (1772)
Policy (125)
Public Transportation (990)
Railroads (301)
Research (2599)
Safety and Human Factors (1549)
Security and Emergencies (179)
Society (227)
Terminals and Facilities (410)
Transportation (General) (329)
Vehicles and Equipment (585)
(n) = Number of projects within this subject.