North Carolina. Office of Bicycle and Pedestrian Transportation; University of North Carolina (System). Highway Safety Research Center(North Carolina Dept. of Transportation, Division of Bicycle and Pedestrian Transportation, 1996-11)
North Dakota. Parks and Recreation Dept.; North Dakota. Dept. of Transportation; DS-Lea Consultants; Marr Consulting & Communications(North Dakota Parks & Recreation Dept. ; North Dakota Dept. of Transportation, 1994-08)