Research On The Influence Of Cooperative Adaptive Cruise Control (CACC) On Driving Behavior Based On VISSIM

With the rapid development of computer technology,communication technology,image recognition technology and many other foreword science and technology and their application in the field of automobile,the degree of intelligent automobile has been continuously improved,and the field of automatic driving and vehicle networking has become a hot spot of many researches.Cooperative adaptive cruise control(CACC)is an extended application of traditional adaptive cruise control in the environment of Internet of vehicles.It is an important technical stage of transition to the most advanced automatic driving.The most important feature of the system is that it can form a stable platoon which can operate cooperatively based on the data interaction of adjacent vehicles,and the headway between vehicles of team members is smaller.This feature can not only improve the efficiency of transportation facilities,but also play a positive role in the improvement of traffic safety,energy conservation and emission reduction.However,because the system partially replaces the driver’s driving task,the driver’s behavior has changed,and the running fleet may have an impact on the driving behavior of adjacent vehicle drivers.This paper focuses on the influence of cooperative adaptive cruise control technology on driving behavior,defines CACC driving rules by using VISSIM software,realizes the simulation of CACC mixed traffic flow,and obtains data based on the modeling of basic three lane highway sections and facilities in diversion area,analyzes the characteristics and differences of driving behavior between mixed traffic flow and traditional traffic flow,and drives CACC mixed traffic flow The influencing factors,influencing ways,influencing degrees and influencing results are analyzed in depth,and valuable conclusions are obtained.It is found that the longitudinal and lateral driving behaviors of vehicles in the mixed traffic flow and the traditional traffic flow are different under the conditions of basic section and diverging area of expressway,different flow levels and different CACC penetration rate.The application of the cooperative adaptive cruise control system does have an impact on the driver’s horizontal and vertical driving behaviors in traffic flow,and it has different changing rules with the change of traffic flow,penetration rate and facility type.There are various factors that cause the significant changes of drivers’ driving behavior in the mixed traffic flow and the traditional traffic flow,including the main effect of four factors: CACC,flow level,penetration rate and facility type,as well as the interaction effect of different factors.Among them,the second-order interaction effect of flow subject effect,facility type and penetration rate,flow level and penetration rate,CACC or not,and the third-order interaction effect of facility type and flow level are the effects that affect longitudinal driving behavior speed,and the effect amount corresponding to flow level factors is the largest,and the effect amount of other interaction is far less than the effect amount of flow level;whether CACC or not,facility type,main effect of traffic level,second-order interaction effect between CACC and facility type,CACC,facility type and traffic level and CACC,third-order interaction effect between facility type and penetration rate are the effects that affect the lane change distance of longitudinal driving behavior,and the main effect of flow level and facility type has a relatively large contribution to the difference,and the second-order interaction effect contributes to the difference The contribution of two thirdorder interaction terms is relatively small.Different factors,i.e.their interaction effects,have different effects on longitudinal driving speed and lateral driving distance.Among them,when CACC penetration rate is lower than a certain threshold,the impact on speed is a negative effect,and then it turns into a positive effect as the penetration rate continues to increase,and the threshold in the basic section traffic flow is lower than the shunting area,the threshold in the basic section is between 0.2-0.4,and the shunting area is between 0.6-0.8;under different flow,the influence effect of penetration rate also presents a "negative before positive" effect The threshold value is about 0.4.The lane change distance of different types of vehicles shows the rule of decreasing first and then increasing with the increase of flow;with the increase of penetration rate,the lane change distance shows the rule of decreasing first and then increasing,and the threshold value is between 0.6 and 0.8.The higher the penetration rate is,the smaller the influence intensity of lane change distance is.