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ASTM E2302-03a(2022)

(Test Method)

Standard Test Method for Measurement of the Luminance Coefficient Under Diffuse Illumination of Pavement Marking Materials Using a Portable Reflectometer

Standard Test Method for Measurement of the Luminance Coefficient Under Diffuse Illumination of Pavement Marking Materials Using a Portable Reflectometer

SIGNIFICANCE AND USE
5.1 The quality of the stripe for visibility in daylight or under road lighting is determined by the luminance coefficient under diffuse illumination, Qd, and depends on the materials used, age, and wear pattern. These conditions shall be observed and noted by the user.  
5.2 Under the same conditions of illumination and viewing, higher levels of Qd correspond to higher levels of lightness.  
5.3 Reflectivity of pavement (road) markings degrade with traffic wear and require periodic measurement to ensure that sufficient line visibility is provided to drivers.  
5.4 For a given viewing distance, measurements of Qd made with a reflectometer having a geometry corresponding to that distance are a good indicator of the visual ranking of material measured.  
5.5 specified by CEN, the measurement geometry of the instrument is based on a viewing distance of 30 m and an eye height of 1.2 m.  
5.6 It shall be the responsibility of the user to employ an instrument having the specified co-viewing angle.
SCOPE
1.1 This test method covers measurement of the luminance coefficient under diffuse illumination of horizontal pavement markings, such as traffic stripes and surface symbols, and pavement surfaces, in a particular viewing direction using a portable reflectometer.
Note 1: The luminance coefficient under diffuse illumination is a measure of the reflection of horizontal pavement markings and pavement surfaces in a particular viewing direction in daylight or under road lighting. Diffuse illumination approximates daylight illumination from the overcast sky, and road lighting as an average of locations on the pavement surface.  
1.2 The co-viewing angle of the reflectometer affects the readings. As specified by the European Committee for Standardization (CEN), the co-viewing angle shall be 2.29°.  
1.3 This test method is intended to be used for field measurement of pavement markings and pavement surfaces but may be used to measure the performance of materials on sample panels before placing the marking material in the field.  
1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

Status
Published
Publication Date
31-Jan-2022
ICS
93.080.20 - Road construction materials
Technical Committee
E12 - Color and Appearance
Drafting Committee
E12.10 - Retroreflection
Current Stage
Ref Project

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ASTM E2302-03a(2022) - Standard Test Method for Measurement of the Luminance Coefficient Under Diffuse Illumination of Pavement Marking Materials Using a Portable ReflectometerASTM E2302-03a(2022) - Standard Test Method for Measurement of the Luminance Coefficient Under Diffuse Illumination of Pavement Marking Materials Using a Portable Reflectometer
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ASTM E2302-03a(2022) - Standard Test Method for Measurement of the Luminance Coefficient Under Diffuse Illumination of Pavement Marking Materials Using a Portable Reflectometer
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:E2302 −03a (Reapproved 2022)
Standard Test Method for
Measurement of the Luminance Coefficient Under Diffuse
Illumination of Pavement Marking Materials Using a Portable
1
Reflectometer
This standard is issued under the fixed designation E2302; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
2
1.1 This test method covers measurement of the luminance 2.1 ASTM Standards:
coefficient under diffuse illumination of horizontal pavement E284Terminology of Appearance
markings, such as traffic stripes and surface symbols, and E809Practice for Measuring Photometric Characteristics of
pavement surfaces, in a particular viewing direction using a Retroreflectors
portable reflectometer.
2.2 Other Standard:
NOTE 1—The luminance coefficient under diffuse illumination is a
CEN EN 1436Road Marking Materials—Road Marking
measure of the reflection of horizontal pavement markings and pavement
3
Performance for Road Users
surfaces in a particular viewing direction in daylight or under road
lighting.Diffuseilluminationapproximatesdaylightilluminationfromthe
3. Terminology
overcastsky,androadlightingasanaverageoflocationsonthepavement
surface.
3.1 The terminology used in this test method generally
1.2 The co-viewing angle of the reflectometer affects the
agrees with that used in Terminology E284.
readings. As specified by the European Committee for Stan-
3.2 Definitions:
dardization (CEN), the co-viewing angle shall be 2.29°.
3.2.1 luminance coeffıcient under diffuse illumination; Qd,
1.3 This test method is intended to be used for field
n—the ratio of luminance, L, in a particular viewing direction,
measurementofpavementmarkingsandpavementsurfacesbut
of a projected surface to the illuminance of diffuse
may be used to measure the performance of materials on
illumination, E, at the surface on the plane of the surface,
-2 -1
sample panels before placing the marking material in the field.
expressed in candelas per square metre per lux (cd·m ·lx ).
3.2.1.1 Discussion—Qd has a range from zero up to a
1.4 This standard does not purport to address all of the
-2 -1
maximum of 1/π = approximately 0.318 cd·m ·lx . For
safety concerns, if any, associated with its use. It is the
convenience, the units used commonly are millicandelas per
responsibility of the user of this standard to establish appro-
-2 -1
square metre per lux (mcd·m ·lx ) providing a range from
priate safety, health, and environmental practices and deter-
-2 -1
zero up to 1000/π = approximately 318 mcd·m ·lx .
mine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accor-
3.2.2 co-viewing angle, a, n—theanglebetweentheplaneof
dance with internationally recognized principles on standard-
the pavement marking surface and the observation axis.
ization established in the Decision on Principles for the
3.2.3 portable reflectometer, n—a hand-held instrument that
Development of International Standards, Guides and Recom-
can be used in the field or laboratory for measurement of
mendations issued by the World Trade Organization Technical
luminance coefficient under diffuse illumination.
Barriers to Trade (TBT) Committee.
1 2
This test method is under the jurisdiction of ASTM Committee E12 on Color For referenced ASTM standards, visit the ASTM website, www.astm.org, or
and Appearance and is the direct responsibility of Subcommittee E12.10 on contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Retroreflection. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved Feb. 1, 2022. Published February 2022. Originally the ASTM website.
3
approved in 2003. Last previous edition approved in 2016 as E2302–03a (2016). Available from European Committee for Standardization (CEN), Avenue
DOI: 10.1520/E2302-03AR22. Marnix 17, B-1000, Brussels, Belgium, http://www.cen.eu.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
E2302−03a (2022)
3.2.4 instrument standard, n—working standard used to directionoftraffic,ortheinstrumentdesignshallitselfindicate
standardize the portable reflectometer. the measuring direction in an obvious manner.
6.2 Illumination System Requirements:
4. Summary of Test Method
6.2.1 The illumination system shall provide diffuse
4.1 This test
...

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1.1 This specification covers re-refined engine oil bottoms, also known as vacuum tower asphalt extender, that may be used in formulating asphalt for pavement construction and roofing. This specification has been developed specifically for these two categories of product and is not intended for other uses. Table 1 is to be used for pavement construction and Table 2 for roofing. “Re-refined engine oil bottoms” (REOB) is the prevailing name used by many state highway agencies and FHWA, while “vacuum tower asphalt extender” (VTAE) is the preferred name used by the manufacturers of the product. Since each name provides an important descriptor of production elements (“re-refined” and “vacuum tower”) for the specific product this specification addresses, this specification uses the term “REOB/VTAE.”  
1.2 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.  
1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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