1.1 This practice covers measurement of the retroreflective properties of retroreflective vehicle markings such as conspicuity tape using a portable retroreflectometer that can be used in the field. The portable retroreflectometer is a hand-held instrument with a defined standard geometry that can be placed in contact with the retroreflective material to measure the retroreflection in a standard geometry. 1.2 This practice is intended to be used for the field measurement of retroreflective vehicle markings. 1.3 This practice covers retroreflective materials designed for use on the frame and body of vehicles, including heavy vehicles, long vehicles, train wagons, emergency vehicles, as well as large containers placed onto or next to the roadway. 1.4 This practice does not set the minimum retroreflective values evaluation criteria for newly installed or in-use levels of retroreflective vehicle markings. It is the responsibility of the agency having jurisdiction to set the acceptable retroreflectivity values within their specifications 1.5 This practice does not address inks, overlays, or other imaging methods that may be applied to the tape material to create distinctive markings or graphics or both. 1.6 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. 1.7 This practice 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.
portable retroreflectometers; retroreflection; conspicuity tape; retroreflective vehicle markings; retroreflective materials
It has a specific use for how to measure retroreflective materials as applied to vehicles versus in a laboratory and has been asked by industry to help with conformance and maintenance of the vehicles markings.
The title and scope are in draft form and are under development within this