Yazar
gerald l ullman
6 cilt bulundu.
Gerald L. Ullman · U.S. Department of Transportation, Federal Highway Administration
68 sayfa · 2014
Intelligent transportation systems / Road work zones / Safety measures
Gerald L. Ullman · U.S. Department of Transportation, Federal Highway Administration
102 sayfa · 2013
Road work zones / Evaluation / Traffic congestion / Management
Gerald L. Ullman · U.S. Department of Transportation, Federal Highway Administration
112 sayfa · 2011
Road work zones / Safety measures / Traffic congestion / Management
Gerald L. Ullman · Texas Transportation Institute, the Texas A&M University System
45 sayfa · 1991
Traffic accidents / Traffic safety
Gerald L. Ullman · U.S. Dept.of Transportation, Federal Highway Administration
57 sayfa · 2011
Road work zones / Safety measures / Performance