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dc.contributor.authorSivak, Michaelen
dc.contributorFlannagan, M. J.en
dc.contributorKojima, S.en
dc.contributorTraube, E. C.en
dc.date.accessioned2007-02-08T18:37:20Z
dc.date.available2007-02-08T18:37:20Z
dc.date.issued1998
dc.identifier90515en
dc.identifier.otherUMTRI-98-2en
dc.identifier.otherPB98-126550en
dc.identifier.urihttps://hdl.handle.net/2027.42/49364
dc.description.abstractThere is some concern that turn signal lamps with clear outer lenses make it difficult in bright, sunny conditions to decide whether the signal is on or not. Two studies were performed. The first study was a survey of current practice in the U.S. with regard to the use of clear-lens turn signal lamps. The main results are that clear outer lenses on rear turn signal lamps are used in about 28% of all vehicle models, while the corresponding percentage for front turn signal lamps is about 70%. The second study photometrically evaluated, under bright, sunny conditions, both luminance contrast and color contrast between the on and off states for turn signal lamps that use either an amber lens or a clear lens. The results indicate that luminance contrast between the on and off states is greater for lamps using an amber lens. On the other hand, the results indicate that color contrast between the on and off states is greater for lamps using a clear lens. Because luminance contrast is likely to be the primary variable influencing driver performance, these results suggest that using clear-lens turn signal lamps is likely to make it more difficult to determine, in bright, sunny conditions, whether the signal is on or not. However, the magnitude of the decrement in real-world performance with clear-lens signal lamps remains to be ascertained.en
dc.description.sponsorshipMichigan University, Ann Arbor, Industry Affiliation Program for Human Factors in Transportation Safetyen
dc.format8 ref. figs. tablesen
dc.format.extent19en
dc.format.extent109062 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglishen
dc.publisherUniversity of Michigan, Ann Arbor, Transportation Research Instituteen
dc.subject.otherTurn Signalsen
dc.subject.otherSunshineen
dc.subject.otherBrightness/ Light Intensity/ Illuminationen
dc.subject.otherColor/ Chromaticityen
dc.titleThe influence of sun loading on the visibility of clear-lens turn signalsen
dc.typeTechnical Reporten_US
dc.subject.hlbsecondlevelTransportation
dc.subject.hlbtoplevelEngineering
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/49364/1/UMTRI-98-2.pdfen_US
dc.owningcollnameTransportation Research Institute (UMTRI)


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