The present study evaluates under laboratory conditions the new road layout of the A4/A86 trunk section prior to its implementation on-site. This plan optimizes the existing infrastructure by using the hard shoulder as an additional traffic lane, during periods of traffic congestion. Its aim is to regulate traffic flow and to break up the biggest traffic jam site in France. One of the main objectives of our study was to insure maximum safety for drivers using this road section. To demonstrate the processes put into play by the 40 test subjects in interpreting the traffic scenes and images of this new layout, we have developed an innovative and experimental methodology. It consists of the projection (in the laboratory) of a simulated journey along a road section, using 3D, computer-generated images. This is combined with a tachistoscopic presentation of the road signs placed on-site. This method has enabled a detailed analysis of the processes put into play by the subjects, in order to perceive and to understand this specific road configuration and its design, and to modify the project in a way so that drivers can safely use the new system. This project, which was put into operation at the end of 2005 after modifications were made, following the results of this experiment, has led to a significant improvement in traffic flow. The evaluation of the safety consequences has been positive to date. (A). For the covering abstract of the conference see E216632.
Abstract