抄録
The advanced surveying technologies have been available to use monitoring of road condition and vehicle running situation. The mobile mapping system can collect 3D spatial road data to estimate road alignment such as sight distance from driver. And more, the precise GPS can detect vehicle trajectory with high accuracy to clarify running position. These new technologies could provide detailed relationship with speed reduction at curve section. Therefore, the objective of this study is to verify influence factor on speed reduction at curve section by using the advanced surveying technologies and evaluation of drivability by questionnaire. It was concluded that the sight distance at short-divided section is critical factor for speed reduction.
