The influence of sun loading on the visibility of clear-lens turn signals

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dc.contributor.author Sivak, Michael en
dc.contributor Flannagan, M. J. en
dc.contributor Kojima, S. en
dc.contributor Traube, E. C. en
dc.date.accessioned 2007-02-08T18:37:20Z
dc.date.available 2007-02-08T18:37:20Z
dc.date.issued 1998
dc.identifier 90515 en
dc.identifier.other UMTRI-98-2 en
dc.identifier.other PB98-126550 en
dc.identifier.uri http://hdl.handle.net/2027.42/49364
dc.description.abstract There 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.sponsorship Michigan University, Ann Arbor, Industry Affiliation Program for Human Factors in Transportation Safety en
dc.format 8 ref. figs. tables en
dc.format.extent 19 en
dc.format.extent 109062 bytes
dc.format.mimetype application/pdf
dc.language English en
dc.publisher University of Michigan, Ann Arbor, Transportation Research Institute en
dc.subject.other Turn Signals en
dc.subject.other Sunshine en
dc.subject.other Brightness/ Light Intensity/ Illumination en
dc.subject.other Color/ Chromaticity en
dc.title The influence of sun loading on the visibility of clear-lens turn signals en
dc.type Technical Report en_US
dc.subject.hlbsecondlevel Transportation
dc.subject.hlbtoplevel Engineering
dc.description.bitstreamurl http://deepblue.lib.umich.edu/bitstream/2027.42/49364/1/UMTRI-98-2.pdf en_US
dc.owningcollname Transportation Research Institute (UMTRI)
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