Research On The Information Content And Layout Setting Of Guide Signs At The Entrances And Exits Of Ring Expressway

The overload of information on guide signs is extremely easy to appear on the ring expressway.On the one hand,the ring expressway is built around the city,connected the expressway outside and the urban road,too much information must be informed.On the other hand,while the building speed of ring expressway is rapid,the specification of road signs about ring expressway is delay.Based on such situation,the study sets the information content experiment about entrance and exit of ring expressway,discusses the reasonable information content of the guide signs under the cantilever type and gantry type support methods.Based on the result of information content experiment,illustrates the layout of entrance and exit about ring expressway.Firstly,discusses the characteristics of roads and traffic at the ring expressway;counts the forms of interchanges used at the ring expressways;explains the concept of information content by two different ways,which are information content based on quantity and information content based on information theory.Secondly,an information experiment for the high-speed entrance and exit guide signs around the city was set up.AutoCAD was used to design the signboards with different numbers of information.The road modeling was carried out using 3D virtual reality software UC-Win/Road.The number of different information signboards was embedded in the modeling road and the software was used to simulate the driving function.In the information search process under the vision environment,the SPSS box map method and the robust estimation theory were used to process the experimental data.It was concluded that when the cantilever support method is used,the number of information pieces is five,and when the gantry type support method is adopted,the number of information items is nine.Thirdly,according to the characteristics of the high speed and internal urban roads of the ring expressway,the guiding information outside the guiding city and the guiding information inside the city are respectively classified,and the information selection method is given.According to the experimental conclusions,the layout plan of the guide sign is given for the expressway entrance sign and export guide sign around the city,including horizontal information to provide two-level place name information,and the longitudinal information at the far end only provides the road number and orientation.Sign-setting principle,detailed forecasting method of setting up a combination of guide signs for brief advance notice,indirect guidance of guide signs under high-density road network environment,setting of guide signs for double exit ramps,diversion ramps,etc.In the end,the Hechizhai Interchange is selected as an example.The conclusions of the information experiment and the layout method are used to set the guide signs.According to information theory,the information model is used to calculate the guide sign information.The amount is calculated,and the information density of each marker is calculated by the short-term memory time;the driver’s information processing capability at different vehicle speeds is calculated;the information density is compared with the driver’s information processing ability,and the verification is based on the number of information.The amount of information set is reasonable.