Standard Test Method for
Retroreflectance of Horizontal Coatings1

This standard is issued under the fixed designation D 4061; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

1. Scope

1.1 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 symbols.

1.2 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. 1).

1.3 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.

1.4 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.

1.5 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.

2. Referenced Documents

2.1 ASTM Standards:
E 284 Terminology of Appearance2
E 308 Praactice for Computing the Colors of Objects by
Using the CIE System2
E 808 Practice for Describing Retroreflection2
E 809 Practice for Measuring Photometric Characteristics
of Retroreflectors2

2.2 CIE Publication:3
No. 54 Retroreflection Definition and Measurement

3. Terminology

3.1 The terms and definitions in Terminology E 284 apply to
this test method.

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