The Technology of Road Guide Signs Setting in Large Interchanges

Large interchange is complicated in structure, which easily leads to the misunderstanding of paths and directions. There are obvious differences in vehicle speed while driving up and down the ramp, and when confluence points, divergent points and conflict points exist at the same time. Therefore, large interchange tends to become an accident black-spot. To ensure traffic safety on the road, the technology of guide signs setting in large interchanges is studied in this paper.In this paper, we conducted a visual recognition test of guide signs. Firstly, the eye tracker Smart Eye Pro4.0 and GPS locator were installed on the experimental cars, and then we arranged different drivers to drive in a real traffic environment. Based on that, all the drivers’ recognition distance parameters and recognition time parameters were found on different illumination and speed conditions. According to the results of the experiment, we tried to find suitable information control for interchange by analysis. With the use of experimental data, the front distance range of guide signs can be deduced based on four stages of discovery, reading, judgment and action. And we came to the conclusion of reasonable repeated setting space with the driver short-term memory characteristic. At last, the calculation results were compared to the existing norms GB5768-2009 in China, and rational suggestions for the methods of guide signs setting in large interchanges were offered.