Abstract
A field study is described which employs a multi-faceted approach to assess the nature and impact of the visibility problems encountered when entering long vehicular tunnels. The methods employed were photometric and performance studies of visibility, a survey of tunnel users, examination of available accident records, and an analysis of traffic flow. Analysis of the northern entrance of the Hampton Roads Bridge-Tunnel in Virginia revealed that a reduction in speed of vehicles entering the tunnel was attributable in part to reduced visibility into the tunnel and in part to factors relating to the geometry of the approach. It is suggested that the procedures used could be profitably employed at other tunnel facilities.
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