Driving Comfort on Highway Tunnel Portal Sections Based on Coordination of Luminance and Speed
To investigate the changing characteristics of driving psychological load in the tunnel portal sections of a two-lane highway in a mountainous area,this paper conducted a real vehicle test with 27 drivers as the subjects in nine tunnels in Chongqing.The driving data of drivers,vehicles and driving environments were collected,and the heart rate growth of the drivers was used to characterize the psychological load of driving.The correlation between drivers'driving psychological load and luminance and speed in the tunnel portal section was investigated through data analysis.The results showed that the psychological load of driving in the entrance section of a two-lane highway tunnel in a mountainous area was greater than that in the exit section.When the ambient luminance is less than 500 cd·m2,the driving psychological load is more sensitive to the luminance change rate,and then the formula for the luminance change rate is proposed.When the luminance change rate is 60%,the psychological impacts of the black hole and white hole effects on drivers tend to be the same.In the tunnel portal section,speed has an amplifying effect on driving psychological load.Based on the driving psychological load value,this study also defined the driving comfort interval of the tunnel portal section,proposed the safety thresholds of luminance change rate and speed based on the driving comfort demand,and developed the luminance curves in consideration of the luminance change rate and the clearance height of the tunnel portal.
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