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dc.contributor.authorSivak, Michaelen_US
dc.contributorSchoettle, B.en_US
dc.contributorMinoda, T.en_US
dc.contributorFlannagan, M. J.en_US
dc.date.accessioned2007-12-13T16:05:31Z
dc.date.available2007-12-13T16:05:31Z
dc.date.issued2005-11
dc.identifier99238en_US
dc.identifier.otherUMTRI-2005-34en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/57452
dc.descriptionIncludes bibliographical references (p. 10)en_US
dc.description.abstractThis study examined the effects of proportional increases in light output throughout the entire headlamp beam pattern on visibility. The baseline beam pattern was a median market-weighted U.S. tungsten-halogen low-beam pattern. Ten derived beam patterns were obtained by multiplying each point in the baseline beam pattern by a constant that ranged from 1.1 to 2.0, in increments of 0.1. Finally, for comparison, we also used the median market-weighted U.S. high-beam pattern. Visibility changes were estimated by calculating the reach of a 3-lux line 0.25 m above the road surface, for both straight and curved roadways. The results indicate that substantial gains in visibility on straight roadways require an increase of about 50% in the overall light output of low beams. On curves, obtaining a substantial gain in visibility in several lateral positions would require significantly greater increase in light output. These results provide an enhanced baseline against which to compare other potential improvements in low-beam visibility, including more localized changes in static beam patterns and adaptive headlighting systems.en_US
dc.description.sponsorshipMichigan University, Ann Arbor, Industry Affiliation Program for Human Factors in Transportation Safetyen_US
dc.format.extent16en_US
dc.format.extent576804 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglishen_US
dc.publisherUniversity of Michigan, Ann Arbor, Transportation Research Instituteen_US
dc.subject.otherOptical Measurements/ Photometryen_US
dc.subject.otherBrightness/ Light Intensity/ Illuminationen_US
dc.subject.otherLowbeam Headlampsen_US
dc.subject.otherVisibilityen_US
dc.titlePotential visibility gains on straight and curved roads from proportional increases in current low-beam intensitiesen_US
dc.typeTechnical Reporten_US
dc.subject.hlbsecondlevelTransportation
dc.subject.hlbtoplevelEngineering
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/57452/1/99238.pdfen_US
dc.owningcollnameTransportation Research Institute (UMTRI)


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