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- W852208465 abstract "Night traffic sign visibility is largely determined by luminance. Sign luminance (SL), in turn, is determined by viewing geometry, retroreflective aspects of the sign material, and headlamp illumination. In recent years, computer modeling of SL has advanced allowing SL to be predicted based on data sets of retroreflective material performance and headlamp luminous intensity matrices. The vast majority of the headlamp data for these computer models are luminous intensity values at specific horizontal and vertical test points as measured on a goniometer in a photometric range. This approach removes the headlamp from its natural mounting on the vehicle. Some researchers have gone a step further removed from an actual vehicle. To address this data gap, the Texas Transportation Institute measured vehicle headlamp illuminance at prespecified points representing typical sign locations. The vehicles were measured without aiming or cleaning the headlamps. Illuminance data will be presented via descriptive statistics and used to calculate luminance for a retroreflective sign in that position." @default.
- W852208465 created "2016-06-24" @default.
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- W852208465 date "2002-01-01" @default.
- W852208465 modified "2023-09-27" @default.
- W852208465 title "HEADLAMP ILLUMINATION PROVIDED TO SIGN POSITIONS BY U.S. VEHICLES" @default.
- W852208465 hasPublicationYear "2002" @default.
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