Earth & Environmental Sciences
asphalt
100%
pavement
93%
engineering
68%
cost
65%
traffic
56%
contract
47%
cliff
31%
cement (construction material)
30%
road maintenance
28%
rehabilitation
28%
school
25%
culvert
24%
liability
23%
tire
22%
document
22%
built environment
21%
civil engineering
21%
soil
20%
teaching
20%
expenditure
19%
material
19%
rubber
19%
coordination
18%
gravel
17%
allocation
17%
economics
16%
innovation
16%
budget
16%
stabilization
16%
intelligent transportation system
16%
GPS
15%
traffic control
14%
speed limit
14%
drainage
14%
evaluation
13%
safety
13%
empowerment
12%
parking
12%
environmental engineering
11%
fiber optics
11%
coffee
11%
leadership
10%
risk management
9%
labor
9%
inspection
8%
conflict
8%
analysis
7%
communication
7%
road
6%
hydraulics
6%
method
6%
need
5%
program
5%