Research On The Setting Of Exit Guide Signs For Interchanges In Expressway Hubs Based On Cognitive Behavior And Load

As a transition node between highways,hub interchanges have complex structures,diverse exit forms,and significant changes in vehicle operating conditions,making them a frequent area for highway accidents.Scientifically setting up warning signs for hub interchange exits can help drivers understand the exit road information in advance,which is of great significance for improving the traffic safety of highway hub interchange exits.The paper focuses on the setting of directional signs at the exit of expressway hub interchanges based on cognitive load.Seventeen common types of graphical directional signs for highway hub interchanges are selected,and the complexity of the sign layout is classified through visual recognition experiments.Based on the dynamic driving simulation experiment of directional signs at the exit of hub interchanges,Analyzed the impact of the setting of directional signs at the exit of hub interchanges on the operation of drivers and vehicles.Firstly,the complexity of visual recognition of graphical directional signs for export forecasts was classified.Selecting 17 common types of graphical directional signs for highway hub interchanges to conduct visual recognition experiments.Evaluating the graphical directional signs for exit warnings from two dimensions: overall and detailed,subjective and objective.Proposing a K-Means algorithm based classification method for the visual complexity of graphical directional signs for exit warnings.The results showed that it is more reasonable to classify the visual complexity of the export preview graphical logo layout into three categories,and the classification results are consistent with the subjective survey evaluation distribution of the participants.Secondly,conducting dynamic driving simulation experiments on the exit guidance signs of hub interchanges.Based on the classification results of the complexity of visual recognition of exit warning graphical directional signs,double exit hub interchanges,ramp diversion exit hub interchanges,and single exit hub interchanges were selected,corresponding to typical hub interchange exit graphical directional signs of high,medium,and low complexity.Three setting schemes were proposed: standard group,1.5km group,and full range group.By constructing dynamic driving simulation experimental scenarios,Collect the parameters of the impact of three corresponding hub interchange exit signage setting schemes on the operation of drivers and vehicles in three different scenarios.Once again,analyzing the impact of the setting of directional signs at the exit of hub interchanges on drivers.Selecting the proportion of lane changing people,lane changing position,and throttle effectiveness as evaluation indicators,and use descriptive analysis and paired t-test methods to analyze the impact of guide sign setting on drivers.The results show that for double exit hub interchanges with high visual complexity,the full process group scheme has a more significant impact on three indicators: the proportion of lane changing people,lane changing position,and throttle effectiveness;The standard group scheme has the best optimization effect in terms of the proportion of people changing lanes,while the full process group scheme has the best optimization effect in terms of lane changing position and throttle utility for the interchange guidance signs at the ramp diversion exit hub in terms of visual complexity;For single exit hub interchanges with low visual complexity,the standard group,1.5km group,and full range group schemes have the best optimization effect in terms of three indicators: the proportion of lane changing people,lane changing position,and throttle effectiveness.Finally,studying the impact of the setting of directional signs at the exit of hub interchanges on vehicle operation.Selecting speed,standard deviation of speed,acceleration,and standard deviation of acceleration as evaluation indicators,and using descriptive analysis and paired T-test methods to analyze the impact of road sign setting on vehicle operation.The results show that for double exit hub interchanges with high visual complexity,the entire group scheme has the best optimization effect in terms of speed and acceleration indicators,while the standard group scheme has the best optimization effect in terms of speed standard deviation and acceleration standard deviation indicators;For the interchange guidance signs at the ramp diversion exit hub in terms of visual complexity,the entire group scheme has the best optimization effect in terms of speed and acceleration,while the standard group scheme has the best optimization effect in terms of speed standard deviation and acceleration standard deviation;For single exit hub interchanges with low visual complexity,the entire group scheme has the best optimization effect in terms of speed and acceleration indicators,while the standard group scheme has the best optimization effect in terms of speed standard deviation and acceleration standard deviation indicators.