AASHTO Designation: T 257..95 (2004)pdf free download

Standard  Method of Test for

Instrumental  Photometric  Measurements of

Retroreflective  Materials  and Retroreflective  Devices

AASHTO Designation: T 257..95 (2004)


AASHTO Designation: T 257..95 (2004)pdf free download

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.


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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