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Roads
1,123
Transportation
383
Traffic
279
Pavements
271
Traffic flow
213
Bridges
184
Highway planning
179
Express highways
174
Freeways
146
Traffic safety
101
Trucks
72
Land use
64
English
8,027
1970-1979
3,644
1980-1989
1,790
1990-1999
1,405
2000-2009
969
1972
960
1973
447
1974
420
1975
313
1977
307
1976
302
1978
267
1979
255
1981
224
1997
211
1970
210
1985
198
1980
196
1986
190
1982
183
1984
175
1996
175
2010-2019
175
1988
167
1971
163
1994
162
1989
154
1995
154
1983
152
1998
152
1987
151
Northwestern University
6,310