 The Division of Highways is responsible for building and maintaining the second largest state maintained highway system in the nation, incorporating over of highways, and 18,540 bridges collectively spanning .The Division of Aviation's mission is to promote the economic well being of North Carolina through air transportation system development and improved aviation safety and education.The Division of Bicycle and Pedestrian Transportation (DBPT) is a comprehensive operation, touching all aspects of bicycling and walking; whether designing facilities, creating safety programs, mapping cross-state bicycle routes, training teachers, sponsoring workshops and conferences, fostering multi-modal planning or integrating bicycling and walking into the ongoing activities of the Department of Transportation.