Standard Method of Test for
Instrumental Photometric Measurements of
Retroreflective Materials and Retroreflective Devices
AASHTO Designation: T 257..95 (2004)
SCOPE
1.1.This standard covers procedures for instrumental determinations of photometric characteristics of retroreflective materials and retroreflective devices.
1.2.The values stated in SI units are to be regarded as the standard.
REFERENCED DOCUMENTS
2.1. ASTM Standards:
E 184, Standard Definitions of Terms Relating to Appearance of Materials
E 308, Standard Recommended Practice for Spectrophotometry and Description of Color in CIE 1931 System ·
E 809, Practice for Measuring Photometric Characteristics ofRetroreflectors
E 810, Test Method for Coefficient ofRetroreflection or Retroflective Sheeting
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