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Abstract:This report of the Transportation Research Board presents information on the policies
and operational characteristics of highway-rail grade crossing warning devices and details
on system components, including advance warning times, train detection, and traffic signal
interconnection. In addition, several advanced highway-rail grade crossing warning
systems in operation are described. Information on highway traffic signal systems is presented,
including traffic controller preemption system characteristics. The need for
agency coordination on signal preemption is emphasized. Based on the survey of highway
and rail agencies conducted for this synthesis, there appears to be a need to improve
the compatibility between traffic operations at highway-rail grade crossings and traffic
operations at signalized intersections in the vicinity of the crossing.
This synthesis is an immediately useful document that records the practices that were
acceptable within the limitations of the knowledge available at the time of its preparation.
As the processes of advancement continue, new knowledge can be expected to be added
to that now at hand.
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