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AASHTO T 257 PDF download
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Standard Method of Test for Instrumental Photometric Measurements of Retroreflective Materials and Retroreflective Devices
| Published by | Publication Date | Number of Pages |
| AASHTO | 2018 | 23 |
AASHTO T 257 – Standard Method of Test for Instrumental Photometric Measurements of Retroreflective Materials and Retroreflective Devices
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.
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