1.1 This practice aims to provide a set of consensus-based standard sign-viewing scenarios to help determine sheeting performance across a wide range of common-use cases. The evaluation is envisioned to be performed by use of validated computer models, some of which are available for public use. The rationale is to determine the luminances provided by a given sign sheeting as observed by the drivers of various vehicles across common, representative, consensus-based scenarios and determine the percentile of drivers served in each of the scenarios. The overall performance metric can then be determined as the average across scenarios or a weighted average as desired by the user. 1.2 Although this practice has been developed to evaluate an individual sheeting, this practice may be used to evaluate a group of sheetings that conforms to the same sheeting type as outlined in Specification D4956 to provide a general idea to the user about the performance of each of these types for different sign applications included in this practice. 1.3 Units--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. 1.3 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 and health practices and determine the applicability of regulatory limitations prior to use.
Keywordscoefficient of retroreflection; performance-based sheeting
Adopted by government agency, used as a supplement to, or incorporated into Specification D4956.
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
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