Study On Speed Behavior Pattern Of Participant Based On Complex Interchange Ramp In Mountain City

At present,the research objects based on driving behavior mainly focus on urban roads and expressways,and the means to obtain data mainly include using model and emulation,field driving test,driving simulator and questionnaire.Most of scholars tend to adopt driving simulator combined with model to discuss driving behavior of participants in diverging area and merging area of expressway,work zone and life zone in urban area,and crossroad at macro and meso perspective.Therefore,based on the prior research,there are only few scholars focus on interchange and ramp,which is characterized by complex horizontal line,poor sight distance and narrow road width,and gradually attracts attention from academic community.In order to investigate the relationship between driving behavior and speed tendency,three interchange in Chongqing are selected as experimental objects to launch field driving experiment with naturalistic driving mode.The experiment is involved seven ramps with three different types and sixty-three participants in total.Mobile Eye and driving recorder are selected as experimental equipment to record speed and driving process.In order to scientifically identify the driving style characteristics of participants,the multidimensional driving style inventory（MSDI）and the temperament type inventory（TTI）before launching field driving experiment.First of all,trend of overall operating speed of three different type ramps are discussed and the positions of trend change are summarized to explore the reason of appearance position combined with alignment characteristics.Besides,the relationship between degree of road familiarity and difference of speed is analyzed,and the specific performance is as follows:with the increase of the number of tests,the running speed is slightly increased.Secondly,combined with alignment characteristics,ascending start/end position and descending start/end position of horizontal curve in every ramp are summarized to analyze the distribution characteristics.In order to provide theoretical support for warning signs of ramp section,the distribute range of the 85^thoperating speed and acceleration/deceleration distance are summarized,and the speed distribute characteristics of descending end position and difference of it are illustrated.Finally,according to the result of MSDI and TTI,the driving behavior and temperament type are distinguished.Combined with the result and personality characteristics,the speed behavior difference among each type participants and speed tendency difference of 15^thand 85^th on gender difference are discussed.The specific performance is as follows:the gender difference is more obvious at the entrance and exit,and men are more seeking"fast"driving experience during driving.Different driving styles and different temperament types have a single style or temperament tends to"fast".Measures should be taken to limit the excessive operation speed in the ramp to avoid traffic conflicts,such as warning signs,colored pavements and speed bumps.