1. Highways and Highway Components
Highway Transportation Characteristics

2. 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

3. Mobility
Road Functions
Accessibility

4. Hierarchical Structure of Road Networks
Rural
Urban

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

6. Hierarchical Structure of Road Networks

7. Mobility vs. Accessibility

8. Mobility vs. Transportation Mode

9. 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

10. Mobility vs. Transportation Mode Capacity
Facility
Vehicles/hr
Persons/hr
Three-lane urban freeway
2,000 x 3 = 6,000
6,000 x 1.7 = 10,200
Three-lane urban arterial
800 x 3 = 2,400
2,400 x 1.7 = 4,080
One lane of buses
100 x 1 =100
100 x 80 = 8,000
One track of light rail
19,000
One track of heavy rail
40,000

11. Mobility vs. Transportation Mode Capacity

12. Highway Components Cross-section

13. Highway Components Highway plan and profile

14. Highway Components Urban Intersections Picture

15. Highway Components Rural Intersections Picture

16. Highway Components Interchanges Diamond Cloverleave Urban directional