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![AS T3-1949 [ Superseded ]](https://www.normfile.org/7713-small_default/as-t3-1949-superseded-.jpg)
1xAS T3-1949...
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1xAS B11-1950 AMDT 2
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AASHTO T 257-96 (2018)
AASHTO T 257-96 (2018) Standard Method of Test for Instrumental Photometric Measurements of Retroreflective Materials and Retroreflective Devices
standard by American Association of State and Highway Transportation Officials, 2018
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This standard covers procedures for instrumental determinations of photometric characteristics of retroreflective materials and retroreflective devices.This method describes procedures used to measure photometric quantities that relate to the visual perception of retroreflected light. The most significant usage is in the relation of the nighttime vehicle headlamps, retroreflector, and driver's eye geometry.
