Factors Affecting Highway Capacity
Lane width
Width of shoulder
Lateral clearance
Commercial vehicles
Road alignment and geometry(curves, Super elevation etc)
Existence of intersections.
One way or two way traffic and number of lanes
Drivers and vehicular characteristics
Single type or mixed traffic
Flow speed
Weather condition
Parking
Presence of pedestrians
DESIGN HOURLY VOLUME & CAPACITY
The traffic volume fluctuates over time ,hence the designing must be done for peak hours,but it will be highly uneconomical to do so.Hence designing is done for reasonable traffic volume termed as “DESIGN HOURLY VOLUME”.