Evaluation of Sign Retroreflectivity Measurements from the Advanced Mobile Asset Collection (AMAC) System (406801-1)

Roadway traffic signs communicate critical information to roadway users. At night, signs not internally illuminated must be fabricated with retroreflective materials for visibility. The most objective method to maintain the minimum level of traffic sign retroreflectivity is through measuring. This project evaluated technology that was built to measure sign retroreflectivity. The static test results were conducted on a closed-course facility to determine the accuracy of the real-time retroreflectivity measurements. Dynamic testing along a closed-course route was performed to assess measurement bias and repeatability. Over 100 signs were evaluated along an open-road test route through Brazos County. Researchers found measurements made from the roadway can provide a better realization of how the sign is seen from the perspective of the nighttime driver.