Research On Vehicle Running Mode&Characteristics Of Traffic Flow Resulting From Pavement Distress

Currently, there are many studies on the cause and maintenance of pavementdistress at home and abroad, but the theoretical results about the influence of drivingbehavior, vehicle driving mode and traffic running style on the condition of pavementdistress is few.The aim of this paper is to reveal the influence of pavement distress ontraffic running, with the guidelines “Theory is based on practice and serves parctice”.Considering the existing road traffic related specifications, this paper’s content whichcovering the driver’s physiological&psychological, driving behavior, traffic flowtheory, studied the vehicle running mode and traffic flow characteristics at pavementdistress road section, by probability and statistics, fluid mechanics theory method.This paper reviewed the existing pavement distress cause, and analyzed thereasons of inspection well covers and its surrounding pavement breakage. Accordingto the existing pavement distress index, its purpose is to develop a measure ofpavement maintenance and repair standards, and it is aimed at the whole road section,rather than to describe individual pavement distress’s severity. The density indexignored the pavement distress location’s effecting on traffic running, and it’s difficultto clear a single pavement distress’s influence to the traffic, therefore conceptlane-complete-wide is put forword. Taking pavement distress’s long, wide, deep andlane-complete-wide as the indexes to describe the pavement distress’s severity, andthe qualitative and quantitative classification is given.According to the study content, analyse the required data, make surveys aboutthe pavement distress’s severity, road condition, the vehicle trajectory, the vehiclerunning mode, and so on. This paper also investigated the drivers’ attitudes topavement distress. The key technology and methods to deal with data was introduced,and then to record, classify, screening, and analyse the data,in order to deeplyresearch.In view of the importance of the pavement distress’s identification, proposed twoconcepts of pavement distress’s “static visual recognition“and “dynamic visualidentification” to describe the characteristics of pavement distress identification.Through the analysis of pavement distress’s severity index and the running state ofvehicles, the influence factors of the pavement distress’s static and dynamic visualidentification are analyzed. The calculation method about pavement distress’sidentification is given. According to the average speed in different level road, theclassification threshold value of “static visual recognition“and “dynamic visualidentification” are given.Then, this paper analysed the influece of pavement distress’s level on driver’sheart rate, found out the reletionship of pavement distress’s level and drivers’ heartrate changes, it shows that pavement distress effect on driver’s psychological is notsignificant, but when the driver found the pavement distress suddenly and had a fear,his heart rate produced significant fluctuations. Analysd the frequency ofencountering pavement distress and the driver’s adverse mood, qualitatively analysepavement distress effect on vehicle driving safety and comfort.Analysed the key factors affecting vehicle mode: pavement distress severity, thevisual recognitionof pavement distress, speed, lane-complete-wide, traffic environment and drivers physiological&psychological quality; according to vehicletrajectory and speed change which are caused by pavement distress, give3trackmode: in the original lane, occupation lanes, change lanes, give3speed mode: theoriginal speed, decelerate, discontinuous running.bby using regression analysismethod, get the vehicle trajectory and speed probability distribution model ondifferent pavement distress levels, and the related parameters were calibrated.Analyse the effect of vehicle speed, traffic volume and vehicle type on the vehiclerunning probability distribution model.At the pavement distress road sections, the continuous traffic flow headways aremeasured, using the Displaced Negative Exponential Distribution model and Weibullmodel to study its distribution, and calculate the traffic capacity of road section withpavement distress, put forward traffic capacity correction factor, determine thepavement distress’s effect on capacity. Analyze the traffic density and velocitychange, using the theory of fluid mechanics, analyze the traffic flow wave’s velocityand its accumulation and dissipation characteristic at pavement distress roadsection.From4aspects of safety, economy, comfort and environmental protection,comprehensively analyze the impact of pavement distress on traffic running by AHPmothod.This paper aims to reveal the internal connection among pavement distress,driver characteristics, driving behavior characteristics, driving mode and trafficrunning characteristics,to improve driving behavior, traffic flow, traffic capacitytheory on conditions of pavement distress. Provide a basic theory for roadperformance evaluation and maintenance from the traffic efficiency perspective.