Based entrance tunnel night visibility safety lighting standards Calculation method and system

The present invention provides a standard illumination calculation method based on the tunnel entrance nighttime visibility of security, by setting different light tunnel environment and determining a position wherein the tunnel, so that the driver of the motor vehicle to drive at different speeds from the outer tunnel the object straight running direction, a driver found obtain desired visual distance D object, and recording the driver of the road surface brightness and the tunnel between the found position wherein surface brightness when the location of the target object difference △ L. Using a plurality of sets of visual distance and luminance difference △ L D data model and the actual model is applied to the tunnel entrance section of the road at night brightness estimates, the parking line of sight in the generation of the maximum design speed speed tunnel into the model formula , to obtain the minimum value of the luminance difference △ L inlet section of the tunnel at night required.