AASHTO PP 74-19 PDF Download

AASHTO PP 74-19 is a standard practice that provides guidelines for determining the size and shape of glass beads used in traffic markings. This determination is done using computerized optical equipment, allowing for accurate and precise measurements. The standard specifies that it is applicable to glass beads with diameters ranging from 0.15 mm to 2.35 mm. The primary purpose of this practice is to ensure that the glass beads used in traffic markings meet the required size and shape specifications, which are crucial for the effectiveness and visibility of road markings. By utilizing computerized optical methods, this standard ensures the reliability and consistency of the measurement process, allowing for standardized testing and assessment of glass beads used in traffic markings.