ce463 lecture 02 highways and highway components
TRANSCRIPT
CE463 Lecture 02
Highways and Highway Components
CE463 Highway Transportation CharacteristicsCivil Engineering Purdue University
OutlineFunctional classification of roads
Road functionsHierarchical structure of road networksMobility vs. accessibilityMobility vs. transportation mode
Highway componentsCross-sectionsHighway plan and profileInterchangesRural and urban intersections
Road Functions
Mobility
Accessibility
Hierarchical Structure of
Road Networks
Rural
Urban
Mobility vs. Accessibility
Road Class Road FunctionFreeways
Surface Arterials
Collectors
Local Roads
Through movement exclusively
Through movement primary and some land access
Traffic movement to higher rank roads, access to abutting properties
Access to abutting land and local traffic movement
Hierarchical Structure of
Road Networks
Mobility vs. Accessibility
Mobility vs. Transportation Mode
Mobility vs. Transportation Mode
Mobility vs. Transportation ModeCapacity
capacity in veh/h = capacity in veh/h/lane x number of lanes
capacity in persons/h = capacity in veh/h x average vehicle occupancy
Mobility vs. Transportation ModeCapacity
Persons/hrVehicles/hrFacility6,000 x 1.7 = 10,2002,000 x 3 = 6,000Three-lane urban freeway
2,400 x 1.7 = 4,080800 x 3 = 2,400Three-lane urban arterial
100 x 80 = 8,000100 x 1 =100One lane of buses
19,000One track of light rail
40,000One track of heavy rail
Mobility vs. Transportation ModeCapacity
Highway ComponentsCross-section
Highway ComponentsHighway plan and profile
Highway Components
Urban Intersections
Picture
Highway Components
Rural Intersections
Picture
Highway Components
Interchanges
DiamondCloverleave
Urban directional