Study On The Aberrant Driving Behaviors Of Car-hailing Drivers And The Impact On Traffic Flow

The use of taxi-hailing apps can easily lead to concentration of attention for drivers,which threatens the safety of traffic and the stability of traffic flow.Through a large number of literature reviews,it is found that there has not been a study on the characteristics of driving behavior and aberrant driving behavior of the special group,and the study on the traffic safety and traffic flow characteristics when there are two or more aberrant driving behavior at the same time has not been seen.The purpose of this paper is to explore the characteristics of driving behavior of car-hailing drivers,and to analyze the impact of aberrant driving behavior on traffic safety and traffic efficiency.Based on this,firstly,the group characteristics and driving behaviors characteristics of the car-hailing drivers based on the online questionnaire investigation were collected,then the structural equation model were built.The survey found that car-hailing drivers generally have family burden.Income from car services can reduce their family financial burden to a certain extent.The structural equation model showed the external factors latent variable "industry factor" had significant effects on the four internal factors latent variable "fatigue driving,distracted driving,other aberrant driving behaviors and driving attitudes" at 0.05 level.Industry factors have a direct and significant impact on the aberrant driving behavior.Secondly,the aberrant driving behavior performance of the car-hailing drivers were analysyed.By summarizing the driving simulation research results of the existing literature on the aberrant driving behavior of car-hailing drivers,it is found that there is a significant difference in the average speed and the average headway distance between the car-hailing drivers and the normal drivers.Finally,the improved NaSch model was built to study the impact of aberrant driving behavior of car-hailing drivers on traffic safety and traffic flow characteristics.In medium and high-density conditions: as the number of vehicles with fatigue increases,and the proportion of distracted vehicles decreases,the number of brakes increases.The greater the trend density,the more obvious the increase.Under the higher density conditions:As the proportion of fatigue vehicles gradually increases from 0.01,the number of distracted vehicles gradually decreases from 0.09.The average value of the head distance showed an upward trend,and the distribution range of the head distance became larger,but the overall distribution was relatively concentrated.In terms of traffic efficiency,when the traffic density is constant,with the increase in the proportion of fatigue vehicles and the corresponding decrease in the proportion of distracted vehicles,the overall traffic flow shows a tendency of increasing volatility,the average speed of vehicles is showing an increasing trend,and the standard deviation of speed is increasing.In terms of traffic flow stability,the occurrence of aberrant driving behavior of the car-hailing drivers makes the road congestion area larger and relatively dispersed,and the congestion time is longer.To sum up,the aberrant driving behavior of car-hailing drivers reduces traffic flow stability and makes traffic flow characteristics more complex.