1.Tunnel and Underground Engineering Design Branch,Shandong Provincial Communications Planning and Design Institute Group Company Limited,Jinan 250101,China
2.College of Transportation,Jilin University,Changchun 130022,China
Aiming at the problem that drivers' depression and tension are easily induced by narrow space, insufficient lighting and limited sightline in tunnels, which further leads to the phenomenon of "slowing down whenever passing through a tunnel" and thus impairs traffic efficiency, a coordinated control method for tunnel vehicle speed and lighting is proposed.First, drivers' visual adaptation characteristics to light intensity in tunnel environments are analyzed, calculation models for the optimal lighting intensity and range under different driving speeds are established, and the control scheme of lighting variation in tunnels is optimized to reduce the interference of the black hole and white hole effects on drivers. Then, combined with indicators such as actual vehicle speed and traffic density in tunnels as well as the levels of emergencies, a method for determining the safe operation speed of tunnels is designed, and the tunnel lighting illuminance is adjusted to meet the requirements of drivers' safe driving. Finally, simulation verification is carried out by using the actual operation data of tunnels in Shandong Province. The results show that the average operation speed and safety efficiency of tunnels are improved by this method through the coordinated control of tunnel vehicle speed and lighting. At present, this method has been put into practical application in some tunnels of the Jiwei Expressway in Shandong Province.
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