1) How much area / high reflectance of the retroreflective material can avoid glare.
For retroreflective materials, glare is mainly caused by the contrast between the retroreflective materials that emit strong reflected light in the visual field space and the surrounding dark environment. The glare intensity has a great relationship with the observation angle, distance and the illumination of the front headlight. Theoretically, it is also related to the area of the light source. The smaller the observation angle is, the closer the distance is, the higher the headlight illumination is The larger the area, the stronger the glare. For the signs set on the road surface, it is not appropriate ｏｒ should not be the first choice to improve glare from the perspective of area improvement, which will have a great impact on the visual recognition effect. More attention should be paid to the selection and optimization of the reflective properties of the retroreflective materials. Generally, the retroreflective materials with the coefficient of retroreflection more than 400cd / lxm2 will have glare that can be accepted ｏｒ quickly adapted by the human eye, while the glare intensity produced by the materials above 600cd / lxm2 will make the human eyes feel very uncomfortable.
2) What are the advantages and disadvantages of protruding road signs / spikes in the tunnel, and whether the lane boundary and lane sideline are necessary to be installed.
I have little contact with the products and applications of the protruding road signs / spikes in tunnels. I dare not analyze the advantages and disadvantages of the products. I think that the material of the raised road signs / spikes, the adhesion mode and the adhesion strength with the road surface are more important than their own reflective performance. When the vehicle tires are impacted and squeezed at high speed, the hidden danger caused by falling off and breaking is not small. Lane boundary and lane edge line can provide a good warning for drivers and passengers when the vehicle trajectory drifts, and the necessity of its existence is obvious.
3) For rural highway retroreflective material practicability and economic analysis (signs and markings).
There are millions of kilometers of rural roads distributed in the vast countryside. Many of them have no signs, markings and other basic security facilities. I think it is a big issue that needs to integrate various factors. Economy and applicability are the fundamental principles. In fact, in recent years, there have been misunderstandings in the selection of retroreflective materials for road traffic signs. Many road signs have not built customized roads, diamond roads and diamond plates in accordance with applicable principles. This is related to the lack of corresponding guidance, persuasion, research ability and awareness of relevant production enterprises, and also lack of independent and professional water The evaluation and demonstration institutions of quasi high are related.
From the perspective of the application of retroreflective materials, rural roads are characterized by less background stray light, small traffic flow, slow speed, narrow lanes, and relatively complex geographical environment. Therefore, the glass bead engineering grade reflective film with relatively low retroreflective performance but high cost performance is used as the main material for identification, and the micro bead engineering grade reflective film with fluorescence performance is used in complex road sections I think it is very appropriate and economical to improve the significance. The micro bead engineering grade reflective film can not only guarantee the outdoor service life of more than 5 years, but also provide a good guarantee for the visibility.