ASTM E1696-15 PDF Download

ASTM E1696-15 specifies a procedure for measuring the retroreflective properties of raised retroreflective pavement markers. The measurements are carried out using a portable retroreflectometer in the field. These measurements can then be compared to minimum requirements to determine whether replacement is necessary.

The standard highlights the importance of the observation angle specified for retroreflectometers, noting that it may differ in different jurisdictions. The test method is intended for field measurements of raised retroreflective pavement markers, but it can also be used to assess the performance of new markers before installation. It covers measurements of markers mounted on road surfaces or placed within snow-plowable metal castings.

The standard also addresses certain considerations and limitations. For instance, it specifies that measurements made with a 0.2° observation angle are related to visual observation of the markers at specific distances when illuminated by tungsten filament light sources like car headlights. It states that markers mounted within castings may have lower measured retroreflective properties due to blocked vehicle illumination. Additionally, the test method is not applicable to markers mounted in depressions cut into the pavement. The standard emphasizes the importance of periodically measuring the luminous intensity of these markers and taking into account factors such as traffic wear, materials used, age, and wear pattern.

It is important to note that this standard does not provide guidance on safety concerns associated with its use. The user of this standard is responsible for establishing appropriate safety and health practices and determining the applicability of regulatory limitations prior to use.