United States Department of Transportation
i
Railroad-Highway Grade Crossing Signal Visibility Improvement Program, Volume I: Final Report
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1987-07-01
[PDF-1.20 MB]
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Abstract:This report documents the methodology, developments, and findings of the two-year study. Among the significant results of this project are: (1) a new set of crossing signal visibility specifications based on widely accepted definitions of motorists' requirements and a demonstration that currently available signals exceed these specifications when properly maintained; (2) the evaluation of seven alterations to standard crossing signal design and operation with respect to performance improvement and maintenance requirements--several of these modifications offer attractive cost/benefit attributes and are recommended for implementation; and (3) the development and evaluation of three tools of potential value to signal maintenance crews: an alignment scope to aid in aiming of the signal for maximum effectiveness, a signal focusing tool to aid in the critical positioning of the signal lamp with respect to the reflector, and a signal flux meter for measuring the light output of crossing and traffic signals--all of these tools were proven effective and would be useful to a conscientious maintenance team. The prototype signal hardware underwent rigorous laboratory, environmental, and field tests. The maintenance tools were evaluated under laboratory conditions.
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