SUBJECT
Roads
Economic aspects
41
Finance
23
Transportation
12
Maintenance and repair
11
Design and construction
8
Road construction
7
Transportation, Automotive
5
Bridges
4
Design
4
Economic development projects
4
Infrastructure (Economics)
4
Public works
4
Construction
3
Costs
3
Environmental aspects
3
Express highways
3
Highway engineering
3
Income
3
Mathematical models
3
Planning
3
Poverty
3
Rural roads
3
Transportation and state
3
Cities and towns
2
Cost of operation
2
Decentralization in government
2
Deforestation
2
Deterioration
2
Economic conditions
2
Economic development
2
Government policy
2
Highway planning
2
History
2
Management
2
Motor vehicles
2
Regional planning
2
Taxation
2
Traffic engineering
2
Underdeveloped areas
2
User charges
2
Africa, Sub-Saharan
1
Agricultural productivity
1
Automobile
1
Automobile ownership
1
Buildings
1
Bus industry
1
Case studies
1
Cavite Coastal Expressway
1
Clearing of land
1
more ...