SUBJECT
Maintenance and repair
140
Roads
135
Pavements
22
Management
18
Safety measures
18
Design and construction
15
Bridges
10
Highway departments
9
Deterioration
8
Finance
7
Traffic signs and signals
7
Employees
6
Personnel management
6
Transportation
6
Addresses, essays, lectures
4
Congresses
4
Data processing
4
Economic aspects
4
Rural roads
4
Snow and ice control
4
Costs
3
Design
3
Government policy
3
Hazardous substances
3
Philippines. Department of Public Works and Highways
3
Planning
3
Road markings
3
Road work zones
3
Toll roads
3
Traffic safety
3
Cost of operation
2
Decentralization in government
2
Environmental aspects
2
Equipment and supplies
2
Evaluation
2
Express highways
2
Fees
2
MacArthur Highway (Central Luzon)
2
Maintenence and repair
2
Materials
2
Mathematical models
2
Motor vehicles
2
Pavements, Concrete
2
Road
2
Road machinery
2
Roads maintenance and repair
2
Streets
2
Testing
2
Traffic flow
2
Transportation agencies
2
more ...