抄録
Control of speed of automobiles on a critical curve of a national road was intended by means of planning the change effects through continuation of coloured road signs along the curve. Coloured road signs, of each 5cm spuare, headed by two safety-red signs as sensing instructions were placed with an interval of 2m and the colour was changed from white to yellow, orange and then to red. The red signs were displayed for about 50m and the colour was then returned again also gradually to yellow. The begin of those stimulations was determined so that the driver could have braked down the speed as low as 40-50km/h before the critical point approached. One year after the setting of the signs only 3.3% of cars passing the curve exceeded the safety limit of 55-60km/h, as compared with 50% before the setting, and no accidents have been reported so far. The experiment clearly demonstrates the importance of forming a short circuit in input-performance mechanism by continuous stimulations.
