Fiber-Optic Parameters of Light Emitting Diode Active-Luminous Traffic Markings Based on Light-Transmitting Concrete

Abstract:

To improve the visualization, intelligence and informatization level of traffic markings, light-transmitting concrete is introduced to highway field, and the light emitting diode (LED) active-luminous traffic marking based on light-transmitting concrete is constructed. The analysis of variance and multiple comparison methods are used to analyze the physical property, lighttransmitting rate and economy of the four types of general-purpose fiber-optic. As a result, Polymethyl Methacrylate (PMMA) fiber-optic is selected as the light-transmitting material. After that, theoretical diameter is determined according to the light-intensity distribution curve and the light-propagation path in fiber-optic. Based on the measured data of 1~8 mm PMMA fiber-optic, the S-shaped curve can effectively fit the change trend of light-transmitting rate with fiber-optic diameter, and it is consistent with the theoretical analysis results. Therefore the PMMA fiber-optic diameter is determined to be 6 mm. Based on the measured visible distance of the LED active-luminous traffic marking under different brightness, color and dosage, using logarithmic regression model, the reasonable fiber-optic dosage is determined to be 2~6 pcs when the design speed is 60~120 km?h-1.

Key words:traffic engineering; active-luminous traffic markings; light-transmitting concrete; light-transmitting rate; visible distance; analysis of variance