Abstract
Dynamic Speed Display Sign (DSDS), which can provide speeding information using a sensor detecting vehicle speed and an electric signboard, has been installed as a speed control measures on some other country's streets especially the sites where it is difficult to install physical devices such as Speed Hump. In order to install the DSDS on the streets in Japan as same as the other countries, consideration of providing information from the DSDS to drivers is extremely important. The purpose of this study is to clarify the effects, which are changing the driving speeds and the acceptance of the DSDS, providing the information about obeying the speed limit through the comparison of the effects of the providing information about speeding. As a result, it was found that while providing information about obeying the speed limit to the drivers could reduce the 85 percentile speed of the vehicles rather than the ordinary speed limit sign, there was no significant difference between the two devices regarding the average speed and the acceptance of the DSDS.
