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ASTM D 8379/D8379M : 2021

Current

Current

The latest, up-to-date edition.

Standard Practice for Evaluating Nighttime Retroreflective Sheeting Effectiveness Using Positive-Contrast Textual Sign Scenario Performance Analysis

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

02-12-2021

€80.76
Excluding VAT

Committee
D 04
DocumentType
Standard Practice
Pages
25
PublisherName
American Society for Testing and Materials
Status
Current

1.1This practice provides a framework to evaluate retroreflective sheeting performance in nighttime driving conditions without a need for field evaluations through a set of sign viewing scenarios representing common use-cases. The evaluation of performance of a specific sheeting is achieved by comparing the luminance provided by a sheeting to the luminance needed by drivers in each scenario. This comparison is expressed in terms of a “Performance Index,” which is a measure for how well the luminance provided to the driver meets their needs, in each of the scenarios. Comparison of the performance index values for different sheeting allows the user to predict differences in nighttime retroreflective performance when those sheeting are used on installed signs.

1.2The driver-needs data is based on textual signs (not on symbolic signs) with positive contrast (sign text being brighter than its background), and the headlamp illumination is assumed to be low-beams; therefore, performance index is applicable only to textual signs viewed under low-beam headlamp illumination.

1.3Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The value 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.

1.4This 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.

1.5This 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.

ASTM B 449 : 1993 : R2015 Standard Specification for Chromates on Aluminum
ASTM E 284 : 2022 Standard Terminology of Appearance
ASTM E 808 : 2023 Standard Practice for Describing Retroreflection
ASTM D 8 : 2022 : REV A Standard Terminology Relating to Materials for Roads and Pavements
ASTM E 808 : 2001 : R2016 Standard Practice for Describing Retroreflection
ASTM D 8 : 2022 Standard Terminology Relating to Materials for Roads and Pavements
ASTM B 209/B209M : 2021 : REV A Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate
ASTM B 449 : 1993 : R2022 Standard Specification for Chromates on Aluminum
ASTM B 209/B209M : 2021 Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate
ASTM D 8 : 2021 Standard Terminology Relating to Materials for Roads and Pavements
ASTM E 284 : 2017 Standard Terminology of Appearance

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