SUBJECT
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Express highways
6
Fatigue
6
Inspection
6
Performance
6
Pollution
6
Quality control
6
Runoff
6
Standards
6
Traffic estimation
6
Transportation, Automotive
6
Asphalt concrete
5
Culverts
5
Highway law
5
Highway research
5
Joints
5
Law and legislation
5
Mathematical models
5
Measurement
5
Motor vehicles
5
Road markings
5
Specifications
5
Subgrades
5
Terrorism
5
Urban transportation policy
5
Costs
4
Economic aspects
4
Guard fences
4
Information storage and retrieval systems
4
Materials
4
Personnel management
4
Piling (Civil engineering)
4
Riding qualities
4
Technology transfer
4
Traffic noise
4
Visibility
4
Weight
4
Accessories
3
Aggregates (Building materials)
3
Air
3
Automobiles
3
Computer programs
3
Concrete
3
Concrete beams
3
Cost effectiveness
3
Emergency transportation
3
Groundwater
3
Highway communications
3
Infrastructure (Economics)
3
Load factor design
3
Median strips
3
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