This test method describes the instrumental measurement of the
retroreflective properties of horizontal surfacing materials, such
as traffic stripe paint systems, traffic tapes, and traffic surface
Specimen preparation, size, and shape must be determined and
specified by the user of this test method. Likewise, the user must
specify the observation and entrance angles to be used (see Fig.
The geometric requirements of this test method are based on
materials for which the relative retroreflectance changes less than
approximately 50 % over the observation angle range from 0.2 to
0.5°. This is illustrated in Fig. 2.
This test method is a laboratory test and requires a facility
that can be darkened sufficiently so that stray light does not
affect the test results. This facility must be capable of housing
the required 15-m test distance.
The values stated in SI units are to be regarded as standard. No
other units of measurement are included in this standard.
This standard does not purport to address all of the safety
concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.
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