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Regulations
The Federal Highway Adminstration has adopted standards for retroreflectometers based on the European Committee for Standardization's (CEN) 30 meter geometry and ASTM's standard test method E-1710 that closely follows the CEN specifications. In response to the adoption of these standards, Mirolux Products, Inc. has designed and produced the Mirolux Plus line of retroreflectometers. Specifically, model MP-30, a 30 meter retroreflectometer, meets the geometry requirements of ASTM's E-1710 standard.
Below is a diagram outlining the basic principle behind retroreflectivity.
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