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Sag Vertical Curve Design Criteria for Headlight Sight Distance (2013) / Chapter Skim
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... 91 CHAPTER 8 CONCLUSIONS AND RECOMMENDATIONS CONCLUSIONS The research has shown that: • The distance at which drivers can detect objects in reality falls significantly short of the headlight SD calculations used in determining the design of sag vertical curves. • Neither changing the length of the curve, the deceleration rate, nor the design speed would be sufficient for increasing the headlight SD.
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