Magnitude and Severity of Passing Accidents on Two-Lane Rural Roads
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1994-11-01
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Abstract:An important safety issue on rural, two-lane roads relates to crashes involving
passing maneuvers, where one vehicle attempts to pass a slower vehicle traveling
ahead in the same direction. The danger occurs largely from the passing vehicle
occupying the opposing lane of travel, making sufficient passing sight distance
critical in such a passing situation. Questions have been raised concerning the
marking criteria for no-passing zones as found in the Manual on Uniform Traffic
Control Devices (MUTCD particularly since such distances differ considerably
from passing sight distance design criteria as given in the American Association
of State Highway and Transportation Officials (AASHTO) "Green Book" (A Policy
on Geometric Design of Streets and Highways). In fact, the MUTCD distances are
approximately one-half those of the AASHTO values for a given vehicle design
speed. In response to these questions, the Federal Highway Administration
(FHWA) initiated a research effort to identify the critical issues and to
develop experimental designs for research to address these issues. From this
research, the highest priority research problem statement was the need to study
the magnitude of the passing-accident problem.
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