| Unlike the construction of expressways in plain areas,mountainous terrain has large terrain and high mountains and deep valleys,resulting in more mountainous expressway tunnels and bridges.At the same time,the exit of the tunnel is directly connected to the interlinked road sections.When the tunnel exit is directly adjacent to the intersecting section,it is difficult to meet the requirements of the general pre-direction signs.As a result,the setting conditions of the traffic signs for the tunnel group-interconnection section are more complicated,and the installation difficulty is much higher than the subgrade section.This paper intends to select multiple parameters such as the driver ’s gaze behavior,saccade behavior,vehicle trajectory,vehicle speed,acceleration of different road sections,etc.through a combination of simulation and real vehicle experiments as evaluation indicators,revealing that the driver is in this particular section Recognize the mechanism of traffic signs,and explore how to set up traffic signs in highspeed tunnel groups in mountainous areas.According to China’s "Code for the Design of Highway Routes"(JTG D20-2017),it can be known that the tunnel-interchange section should ensure the setting of the front guide signs,and the distance between the tunnel-interchange should not be less than1000 m,otherwise it should be in front of the tunnel entrance or in the tunnel Set the teaser flag.In actual driving activities,due to the different degree of driver’s familiarity with the road,when more than two place names are marked on the traffic signs,most drivers can perform corresponding driving behaviors according to their own needs.According to calculations,the information induction of the traditional traffic signs at the top of the tunnel is insufficient to give the driver complete road information on the road,which may easily lead to a traffic accident or the driver to miss the ramp.First of all,this paper proposes to separate the notice signs set in the tunnel,that is,the distance information and location information in the signs are set on different signs separately.The location information is in the form of a traditional tunnel top mark,while the distance information is set in the form of a tunnel side wall mark.According to the regulations for setting traffic signs in China,combining the ergonomics and visual dynamics theory,the layout size and content of the traffic signs at the side walls of the tunnel and the traffic signs at the top of the tunnel are studied,as well as the vertical spacing between the separate signs.Secondly,simulation tests of various traffic sign schemes on the side walls of tunnels are carried out.Based on the glance behavior objects of driver’s eye movement behavior,the entropy weight matter-element model was used to compare and select the schemes to find the most suitable traffic sign setting scheme for the highway exit behavior in mountainous areas.The results show that the traffic signs on the left wall of the tunnel with the word height,width and word spacing of 1.5m can ensure the road safety of minibuses in the tunnel group-interchange section.Finally,according to the optimal distance between the traffic signs and the optimal plan of the signs,simulation scenarios of different tunnel groups and inter-interval distances are established,and experiments are performed in combination with the traffic volume and traffic composition of a mountainous highway.The driving behavior is collected by collecting the driving trajectory,speed and acceleration of the driver,and the game driving behavior of the vehicle in the deceleration lane under sudden conditions is analyzed using game theory,and the road section safety evaluation is performed according to the deceleration discrimination method.The results show that the traffic assistance signs proposed in this paper can improve the driver’s need for the distance between tunnel groups and interpass sections and increase driving safety when conditions are limited. |
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