Just noticeable differences for low-beam headlamp intensities
dc.contributor.author | Sayer, James R. | en |
dc.contributor.author | Flannagan, M. J. | en_US |
dc.contributor.author | Sivak, M. | en_US |
dc.contributor.author | Kojima, S | en_US |
dc.contributor.author | Flannagan, C. C. | en_US |
dc.date.accessioned | 2007-02-07T19:56:39Z | |
dc.date.available | 2007-02-07T19:56:39Z | |
dc.date.issued | 1997 | |
dc.identifier | 89658 | en |
dc.identifier.other | UMTRI-97-4 | en |
dc.identifier.other | PB97-147300 | en |
dc.identifier.uri | https://hdl.handle.net/2027.42/49359 | |
dc.description.abstract | A recent study by Huey, Dekker, and Lyons (1994) concluded that a difference between two signal lamp intensities of less than 25% cannot be detected reliably by most drivers. Consequently, Huey et al. recommended that an intensity difference of 25% be used as a criterion for inconsequential noncompliance with federal regulations for signal lamps. The present study was designed to evaluate just noticeable differences for glare intensities of oncoming low-beam headlamps. The results of this study indicate that, under controlled conditions, just noticeable differences in the low-beam headlighting context are between 11% and 19%. In real-world conditions, just noticeable differences would probably be somewhat larger. Therefore, the recommendation by Huey et al. of using 25% as a criterion for inconsequential noncompliance of signal lamps is also about right for low-beam headlamps, at least with respect to how headlamps themselves are perceived by other drivers (such as discomfort glare). The 25% value may also apply with respect to how headlamps affect the ability of drivers to see illuminated objects, but further research on that issue would be desirable. | en |
dc.description.sponsorship | Michigan University, Ann Arbor, Industry Affiliation Program for Human Factors in Transportation Safety | en |
dc.format | 4 ref. fig. table | en |
dc.format.extent | 12 | en |
dc.format.extent | 138288 bytes | |
dc.format.mimetype | application/pdf | |
dc.language | English | en |
dc.publisher | University of Michigan, Ann Arbor, Transportation Research Institute | en |
dc.subject.other | Headlamps | en |
dc.subject.other | Brightness/ Light Intensity/ Illumination | en |
dc.subject.other | Glare/ Dazzle | en |
dc.subject.other | Perception | en |
dc.subject.other | Subjective Rating | en |
dc.title | Just noticeable differences for low-beam headlamp intensities | en |
dc.type | Technical Report | en_US |
dc.subject.hlbsecondlevel | Transportation | |
dc.subject.hlbtoplevel | Engineering | |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/49359/1/UMTRI-97-4.pdf | en_US |
dc.owningcollname | Transportation Research Institute (UMTRI) |
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