2020 Volume 6 Issue 2 Pages A_48-A_54
Junction of the deep underground expressway which is currently under construction has a specific road structure that steep slopes, sharp curves and split or merge points are concentrated in a short section. It has been proved in a previous study that driver's load increases by targets of attention concentrated at bifurcation area due to lack of information on downstream side of the successive branches. In addition, it has been suggested that it also induces rapid deceleration at the bifurcation. In this study, application of color-coordinated destination indicators as a guidance method not solely depending on traffic guide signs has been examined as a possible countermeasure against abovementioned problems. Upon analysis of behaviors of vehicles and drivers obtained from indoor driving experiment using the driving simulator, effectiveness of the color-coordinated destination indicators as a countermeasure against the problems have been verified. As a result, it has been confirmed that the color-coordinated destination indicators may make driver recognize the course earlier and that it reduces driver's load at bifurcation area eliminating the rapid deceleration factor.
