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Headlamp Illumination Provided to Sign Positions by Passenger Vehicles. Research rept. Sep 97-Aug 02.
| 题名： | Headlamp Illumination Provided to Sign Positions by Passenger Vehicles. Research rept. Sep 97-Aug 02. |
| 作者： | Chrysler-S.T.; Carlson-P.J.; Hawkins-Y.G. |
| 关键词： | *Passenger-vehicles; *Headlamps-; *Illuminance-; *Sign-visiblity.;Literature-review; Motor-vehicles; Traffic-control-devices; Sign-luminance. |
| 摘要： | Traffic sign visibility at night is largely determined by sign luminance. Sign luminance, in turn, is determined by viewing geometry, retro reflective characteristics of the sign material, and headlamp illumination. Computer modeling of sign luminance has advanced to allow sign luminance to be predicted based on data sets of retro reflective material performance and headlamp luminous intensity matrices. This research project sought to assess the amount and variability of illumination provided to sign positions by a sample of Texas vehicles. The Texas Transportation Institute measured vehicle dimensions and headlamp illuminance at prespecified points representing typical sign locations. Data collection included 25 passenger cars and 21 light trucks and vans. |
| 报告类型： | 科技报告 |
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