Refined Design Of Road Entrance And Exit Marking Based On Driving Track + Viewing Area

As an important traffic management facility on urban roads,traffic markings convey road information to drivers,and the rationality of their setting is crucial.At present,my country provides unified guidance for marking design in accordance with the standards of urban road traffic management facilities,and has certain design flexibility.There are some road entrance and exit markings that are not designed according to local physical structure,driving speed and other indicators.It makes the vehicle inevitably roll over the solid line during the driving process,resulting in traffic violations.Aiming at the above phenomenon,the thesis uses the theoretical knowledge of traffic investigation and analysis,traffic design,mathematics,statistics and other disciplines to conduct research on the refined design of urban road entrance and exit markings through the integration of theoretical analysis and case design,a design method of the length of the solid line segment at the starting point of the entrance and exit markings based on the driving track +viewing area test is proposed to ensure the driving safety of road entrances and exits.It mainly includes the following aspects:(1)The traffic characteristics of road entrances and exits,the sight distance and the sight area of driving are studied;the design principles and design points of the entrance and exit markings of quasi-expressways are discussed.(2)Select the entrance and exit of the West Central Ring near the south coast of Yumen river in Taiyuan City and the entrance and exit of the main and auxiliary roads in the Waliu near the main entrance of the University of Science and Technology as the research sites,design an experimental plan,observe the behavior of vehicles changing lanes and rolling over the solid line and the starting and ending position intervals of lane changes,and collect vehicle lane-changing operation data is processed and analyzed to lay a data foundation for subsequent research.(3)Several vehicle lane-changing trajectory models at home and abroad are compared and analyzed,and the quintic polynomial trajectory is selected as the reference trajectory for planning vehicle lane-changing;the objective function of the lane-changing trajectory is determined;the optimal lane-changing time is obtained by using the bat algorithm,then the optimal quintic polynomial trajectory function in determined by simulation,and the optimal planning of lane change trajectory is completed.(4)Based on the quintic polynomial model,Matlab is used to simulate the driving trajectory,and the starting and ending points of the lane change are determined;based on the principle of view area safety,the length of the shortest distance of the solid line at the physical position(triangular end)of the main and auxiliary intersection entrances and exits was verified by using the range of the rear-view mirror.According to the research results,a refined design of the entrance and exit markings is carried out.This paper proposes a refined design scheme for the markings of the entrances and exits of urban roads.Within the specified speed range of the road,the markings are refined based on the vehicle’s driving trajectory and the security of the design is checked by using the vehicle rear-view mirror viewing area.The specific analysis of the situation provides some references for the refined design of road entrance and exit markings.