Study On The Men-Machine Relation Of Variable Message Signs

Traffic guidance system is an important subsystem of Intelligent Transportation Systems, whose common form is Variable Message Sign (VMS) traffic guidance system. VMS traffic guidance system provides the guidance information to drivers by the electronic display brand installed in the roadside or the highway. The VMS information includes traffic situation, parking and environment etc.Although VMS traffic guidance system were developed and applied broadly since 1960's, but the design of the system is very difficult to reach distribution of traffic loading on the road network balanced and makes the road availability maximal, optimum consumer target.Studying by the document home and abroad, from man-machine engineering theory and for designing the VMS system, need to study the"human"-drivers, "machine"- VMS facilities, "environment"-space spread. Therefore, the paper study on the cognitive quality, readability, visibility and space location of VMS.The cognitive quality of VMS is carries out from driver's mentality and behavior, including that the driver's reaction to the information of VMS and the driver's individual attribute diversity over the cognitive quality of VMS. The paper use of the method of consultation and SP to analysis the impact the driver's reaction, a disaggregate choice analysis method used to analyze the SP data, and a multinomial logit model (MNL) estimated.The readability and visibility of VMS mainly displays in content, form, color, typeface of the VMS. The paper produced the formulas to calculate the font size and the typeface size, proposed the best form information issue through the questionnaire survey.The space location of VMS is the most difficult problem at present; these models most probably are theoretical research, although many documents has brought forward the different model to here at home and abroad. The thesis brings forward the different model in different road net, the traffic applying development and the random in road net being composed of in express highway and city turnpike road solves coming the network model choosing the location problem; Mathematics plan model applying in the network owing to affecting an exponent in city; And have given the formula to calculate the definite location of VMS's.