Study On The Influence Of Highway Alignment On Traffic Safety Under The Condition Of Traffic Flow

Road traffic system is an integrated system integrating "man-vehicle-road".Traffic accidents are usually caused by the joint action of elements in the system.In order to reduce the traffic accident rate,this paper starts from the "man-vehicle-road" system and adopts field driving test to collect the line data of the measured section,the heart rate and eye movement data of the measured personnel and the traffic flow around the measured vehicles.The driver's heart rate,pupil diameter,viewpoint coordinates and traffic flow viscosity coefficient were selected to represent the stress response of the driver under the influence of traffic flow and highway environment during driving.In order to study the changes of the driver's viewpoint more objectively,the coordinates of the fixation points were grouped to calculate the area of the driver's visual interest area.During the test,the test instrument is affected by some interference signals,resulting in large data dispersion.In order to reduce errors,MATLAB is used in this paper in combination with wavelet packet decomposition method for noise reduction of test data,and the low-frequency part with more stable information is selected for subsequent analysis.Through macro analysis,the influence of highway straight line length and circular curve radius on drivers' heart rate under the condition of traffic flow and without traffic flow is compared.It is found that drivers' heart rate changes under the influence of traffic flow are more obvious than that without traffic flow.Through microscopic analysis,the relationship model between the straight line length of the highway and the driver's heart rate and the relationship model between the radius of the circular curve of the highway and the driver's heart rate are obtained respectively,and the validity of the model is verified respectively.The linear length and circular curve radius of desert highway are modified by the model.Before analysis with and without traffic flow under the condition of the highway extension line of the highway line and curve radius of the influence of the length to the driver's visual information capacity,calculated with and without traffic flow of highway circular curve radius and the pilot pupil diameter relation model and former extension linear curve radius and the driver visual interest area of relational model;The validity of the model is verified respectively.The relation model between highway straight line length and driver pupil diameter and the relation model between highway straight line length and driver visual interest area under traffic flow coupling condition are obtained,and the validity of the model is verified.Further analysis based on drivers' visual interest area and traffic flow of highway after accept before the circular curve radius and the length of straight line,a comprehensive model of above research for desert highway circular curve radius and the straight line length and answer the long straight line and curve radius before the pick line length and followed by circular curve radius combination design provides a theoretical basis.