Installation Of Anti-glare Facilities For High-grade Highways Under Different Advanced Conditions

While the transportation industry is developing steadily,people are paying more and more attention to the number of traffic accidents and fatalities.Among them,the glare caused by the illumination of the oncoming car lights is a major factor in traffic accidents during night driving.At present,most of the anti-glare facilities in our country are uniformly set standards,and there are hidden traffic hazards under different terrain,landforms and road alignment conditions.In order to make the anti-glare facilities better adapt to the road alignment,this paper establishes the calculation model of the shading angle,the distance and the height of the anti-glare board and the plant anti-glare based on the analysis of the influence of road alignment conditions,design speed and road width on the installation of anti-glare facilities through analysis of glare influence mechanism.Established the offset setting model and height calculation model of the anti-glare facilities on the flat curve section based on the visual distance inspection.The results show that under different road alignment conditions,design speeds,lane combinations and other conditions,the distance and height calculation methods for anti-glare facilities are different.The distance between the anti-glare facilities in the flat curve section is smaller than that in the straight line section.The distance between the anti-glare boards in the straight line section is recommended to be 66.80cm-77.97cm.The anti-glare distance between plants is recommended to be 9.95m-32.28m.It is recommended to take 52.16-86.51cm for the distance of anti-glare board in flat curve section under the limit minimum radius.The recommended distance between plants is 3.40m-12.81m.The concave vertical curve section requires greater height of the anti-glare board than the straight slope section.The recommended minimum height of anti-glare facilities for straight slope sections is 1.82m.It is highly recommended that the anti-glare facilities of the concave vertical curve section be>1.90m.After considering the line-of-sight inspection,the distance offset of the anti-glare facilities is recommended to be 0.2m-0.73m,and the height setting is recommended to be≤1.98m under the condition of the limit minimum radius.Finally,taking the reconstruction and expansion project of Heida Highway(Qinggang-Lanxi)as an example,the anti-glare facilities of this project are optimized according to the above conclusions and design reference values.The practicability of the research results of this paper is verified,and it can provide reference in the actual anti-glare facility design and construction process.