Sag Vertical Curve Design Criteria for Headlight Sight Distance (2013) / Chapter Skim
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vi AUTHOR ACKNOWLEDGMENTS The research reported herein was performed under NCHRP Project 15-41 by the Center for Infrastructure Based Safety Systems (CIBSS) at the Virginia Tech Transportation Institute (VTTI)
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vii ABSTRACT This document is the final report for NCHRP Project 15-41, "Sag Vertical Curve Design Criteria for Headlight Sight Distance." This report includes a review of the current methodologies used in the design of sag vertical curves, a review of the changes in headlamp technologies, the results of the survey of practitioners, two visibility experiments, and discussion on potential changes to the American Association of State Highway and Transportation Officials (AASHTO) design guide.
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1 CHAPTER 1 INTRODUCTION The evolution of the typical vehicle headlamp has undergone a significant transition in recent years. Traditional headlamps were simply sealed-beam lamps, whereas modern headlamps are well-designed optical instruments that provide more effective light control than was previously attainable.
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