Comparable Capacities Under Different Operating Assumptions
Provided below are some the vehicle and people-moving capacities for a single freeway lane, a light rail transit (LRT) line and a Personal Rapid Transit (PRT) line. There are no buses, carpools or vanpools on the freeway lane and it is not a HOV lane. It is operating under ideal "free flow" conditions which are often degraded by accidents, incidents and other capacity-reducing events.
As shown, PRT has an advantage over a freeway lane and LRT line if it is operated with minimum headways of 1 second or less and all the other assumptions for all three modes are valid.
|Maximum Vehicles/hour past a point||Min. Headway||% Empty Vehicles||Avg. Occup. of Used Vehicles (persons)||Capacity: People/hour||PRT Advantage over Freeway||PRT Advantage over LRT #1||PRT Advantage over LRT #2|
|One Freeway Lane||2,200||0%||1.1||2,420|
|LRT Line #1||12||5 min.||0% (all seats filled, no standees)||152 (2- 90' cars)||1,824|
|LRT Line #2||12||5 min.||0% (all seats filled, no standees||304 (4-90' cars)||3,648|
|One PRT Line||7,200||1/2 second||30%||1.5||7,560||3.1 to 1||4.1 to 1||2.1 to 1|
|One PRT Line||3,600||1 second||30%||1.5||3,780||1.6 to 1||2.1 to 1||1 to 1|
|One PRT Line||1,800||2 seconds||30%||1.5||1890||0.8 to 1||1 to 1||0.5 to 1|
Last modified: March 28, 2001