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Thread: Speed perception and Headlights

  1. #1
    Should Get Out More Gedge's Avatar
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    Default Speed perception and Headlights

    No I dont want a new debate....

    A friend needs to find some documents about how the use of headlights tends to make others misjudge their speed and judge their speed to be higher..

    I have tried search but there is so much stuff listed I cant find what I am looking for..

    anybody have any links to official documents ( as opposed to personal experiences) which show that people over estimate speed of vehicles with bright lights on??

    TIA

    PS needed rather urgently
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    Should Get Out More ink ink's Avatar
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    Default Re: Speed perception and Headlights

    Good luck.
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    Should Get Out More Gedge's Avatar
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    Default Re: Speed perception and Headlights

    Quote Originally Posted by Baketech View Post
    Google "crypsis by counterillumination".
    Thanks but I am not after info about camouflage effects.. quite the opposite.. it was an article where it was shown that people judged bikes with headlights on as going faster than ones that were not displaying lights...........
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    Should Get Out More Horse's Avatar
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    Default Re: Speed perception and Headlights

    Check my recent thread in SA, read the report, it may be m ed ntioned /refernced there

    Also, search for posts by me, include ovrr- under- estimation speed. Try search for hills too.
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    Should Get Out More Horse's Avatar
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    Default Re: Speed perception and Headlights

    Quote Originally Posted by Gedge View Post
    Thanks but I am not after info about camouflage effects.. quite the opposite.. it was an article where it was shown that people judged bikes with headlights on as going faster than ones that were not displaying lights...........
    I can't remember any details, but I think there was a cross-over (poss. 30mph) where there was under-estimation with light below 30 and over-estimation above.
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    Really Bored slowsider's Avatar
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    Default Re: Speed perception and Headlights

    Shaw 1979

    Compared the accuracy with which subjects estimated the speed of a motorcycle with headlamp on, and off.

    Subjects over-estimated the speed for lower speed of approach
    Subjects under-estimated the speed for higher speed of approach

    The reversal from over- to under- took place between 50-55mph with the headlamp off, and between 35-40mph with the headlamp on.
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    Should Get Out More Horse's Avatar
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    Default Re: Speed perception and Headlights

    Now tell us where you C&P it from
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    Really Bored slowsider's Avatar
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    Default Re: Speed perception and Headlights

    Quote Originally Posted by Horse View Post
    Now tell us where you C&P it from

    You either here, the other place or an email. Not from the source document sadly.


    But maybe items 11 & 13 HERE are relevant to the OP
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