Comparison of Interior Structures in Expressway Tunnels
To drive safely and smoothly within a tunnel, the lighting and interior structure must be designed to convey visual information is correctly to the driver. Recently, in Japanese tunnels, white lights with high color-rendering properties have become standardized, which has contributed in improving the visual environment of the tunnel. However, the height of the interior structure of white light tunnels has been changed from 3.5m to 2.5m since September 2013. This paper will assess alternatives for this interior structure using a driving simulator to experiment visual fixation points from small and large vehicles, and results from a questionnaire.