Arterial Bus Rapid Transit
Arterial BRT is a combination of Transit Signal Priority (TSP), roadway improvements
including queue jump lanes and IBS along arterial routes.
Signal Priority (TSP)
TSP facilitates the movement of transit vehicles
through traffic-signal controlled intersections. When buses are behind schedule,
special devices on the buses send signals to detectors installed at traffic-signal
controlled intersections, which automatically give the bus priority by extending
a green, shortening a red or providing queue jumps. TSP is a great benefit because
it ensures schedule adherence and improves travel times along busy arterial routes.
The time savings, though small at each intersection, create a significant decrease
in travel time over the course of our entire bus route. There is evidence of this
along Cermak Road where TSP has been active for several years; there has been
a 7 to 20% reduction in transit travel times along this route.
Queue Jump By-pass Lanes
In addition to TSP, queue jump by-pass
lanes are also a major component of Arterial BRT. Queue jump by-pass lanes in
combination with bus specific signals and TSP allow buses to proceed along their
route before other traffic. The idea is to enable buses to by-pass waiting queues
of traffic and cut in front by getting an early green signal. Queue jump lanes
are short stretches of bus lanes at traffic-signal controlled intersections. With
TSP, buses in queue jump lanes receive signals to proceed before other traffic
at the intersection. Queue jump lanes can be turning lanes or permit buses to
move straight through intersections.
Here is a typical corridor showing Arterial BRT & advanced