CE 463 Lecture 02 Highways and Highway Components

CE 463 Lecture 02 Highways and Highway Components CE 463 Highway Transportation Characteristics Civil Engineering Purdue University

Outline Functional classification of roads Road functions Hierarchical structure of road networks Mobility vs. accessibility Mobility vs. transportation mode Highway components Cross-sections Highway plan and profile Interchanges Rural and urban intersections

Road Functions Mobility Accessibility

Local Arterial Hierarchical Structure of Road Networks Collector Rural Urban

Mobility vs. Accessibility Road Class Road Function Freeways Through movement exclusively Surface Arterials Through movement primary and some land access Collectors Local Roads Traffic movement to higher rank roads, access to abutting properties Access to abutting land local traffic movement

Hierarchical Structure of Road Networks

Mobility vs. Accessibility

Mobility vs. Transportation Mode

Mobility vs. Transportation Mode

Mobility vs. Transportation Mode Capacity 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 Mode Capacity Facility Three-lane urban freeway Three-lane urban arterial One lane of buses Vehicles/hr Persons/hr 2, 000 x 3 = 6, 000 x 1. 7 = 10, 200 800 x 3 = 2, 400 x 1. 7 = 4, 080 100 x 1 =100 x 80 = 8, 000 One track of light rail 19, 000 One track of heavy rail 40, 000

Mobility vs. Transportation Mode Capacity

Highway Components Cross-section

Highway Components Highway plan and profile

Highway Components Urban Intersections Picture

Highway Components Rural Intersections Picture

Highway Components Interchanges Diamond Cloverleave Urban directional