ASTM D4383−12 Standard Specification for Plowable Raised Retroreflective Pavement Markers

ASTM D4383−12 Standard Specification for Plowable Raised Retroreflective Pavement Markers

Scope
1.1 This specification covers a type of plowable, retroreflective, raised pavement marker for lane marking and delineation.

1.2 Retroreflective markers are intended for nighttime visibility.

1.3 The values stated in inch-pound units are to be regarded as the standard except where noted in the document.

The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

1.4 The following precautionary caveat pertains only to the test methods portion, Section 10, of this specification:

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.

ASTM D4383−12 Standard Specification for Plowable Raised Retroreflective Pavement Markers

Terminology
3.1 Definitions:

3.1.1 cleanability—the ability of a raised retroreflective marker to keep its optical surfaces clean under traffic and environmental conditions.

3.1.2 coeffıcient of luminous intensity, RI—the ratio of the luminous intensity (I) of the retroreflector in the direction of observation to the illuminance (E) at the retroreflector on a plane perpendicular to the direction of the incident light, expressed in candelas per lux (cd/lx) (see Practice E808 and Terminology E284)