MARC Home Page > Transportation Department > ITS Architecture > Market Packages > Definitions
This
market package manages highway traffic at highway-rail intersections (HRIs)
where operational requirements do not dictate more advanced features (e.g.,
where rail operational speeds are less than 80 miles per hour). Both passive
(e.g., the crossbuck sign) and active warning systems (e.g., flashing
lights and gates) are supported. (Note that passive systems exercise only
the single interface between the roadway subsystem and the driver in the
architecture definition.) These traditional HRI warning systems may also
be augmented with other standard traffic management devices. The warning
systems are activated on notification by interfaced wayside equipment
of an approaching train. The equipment at the HRI may also be interconnected
with adjacent signalized intersections so that local control can be adapted
to highway-rail intersection activities. Health monitoring of the HRI
equipment and interfaces is performed; detected abnormalities are reported
to both highway and railroad officials through wayside interfaces and
interfaces to the traffic management subsystem.
