Evaluation of Michigan's engineering improvements for older drivers.
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2015-09-01
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Abstract:In 2004, the Michigan Department of Transportation (MDOT) began a comprehensive program
to implement engineering countermeasures to address the needs of older drivers. The
countermeasures included the use of Clearview Font on Guide Signs (freeway and non-freeway),
installation of Box Span signals, installation of pedestrian countdown signals, use of Fluorescent
Yellow Sheeting on warning signs, and use of arrow-per-lane on guide signs. This study aimed
at evaluating safety benefits of the selected countermeasures. Evaluation was performed through
a perception survey of Michigan drivers and analysis of crash data. Safety Performance
Functions (SPF) for these improvements were developed as part of the study. Crash
Modification Factors (CMF) for each countermeasure were developed through the before-after
analysis of crash data. Finally, the benefit cost analysis of each countermeasure was performed
and is documented in this report.
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