Road Marking ‘Optical Dot System’ for Controlling the Speed--Development and Four Years Empirical Analysis

The innovative road marking “Optical Dot System” (ODS) was conceived through the “Sequence Design” (SD) Project for Driving-Environment Improvement, seeking new approach of the measures for safety in Metropolitan Expressways (MEX) in 2006. This paper attempts to report the circumstances of ODS development and the evaluation of the effect at the site. ODS is installed to two-lane highway in MEX at the section of vertical alignment beyond the Junction with exceeding speed traffic (more than 60%). Soon after the installation, it was observed the speed reductions to higher speed traffic at downward slope, especially in the nighttime. It showed the sift nearly 20% of High range: 100-120km/h to Mid range: 80-100km/h. In parallel, the authors performed the Subject Experiment at Laboratry in Univ. of Tokyo (UT) to evaluate the direct impact of ODS to visual perception and behavior by using the Driving Simulator generating VR of the highway. The experimental results supported the hypothesis that driving operation is controlled by ODS. After 4 years of the installation in MEX, the authors analyzed the collected data in the ODS layout section to verify the transition for 6 years (incl. 2 years before the installation). As the result, the speed reduction trend has been kept through 4 years and proved the sustainable long-term effectiveness of ODS.

  • Availability:
  • Supplemental Notes:
    • Abstract used with permission of ITS Japan. Paper No. 3954.
  • Corporate Authors:

    ITS Japan

    Tokyo,   Japan 
  • Authors:
    • Ayumi, Han
    • Shintaro, Ono
    • Katsushi, Ikeuchi
    • Yoshihiro, Suda
    • Masato, Sasaki
  • Conference:
  • Publication Date: 2013


  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; Photos; References; Tables;
  • Pagination: 10p
  • Monograph Title: 20th ITS World Congress, Tokyo 2013. Proceedings

Subject/Index Terms

Filing Info

  • Accession Number: 01542676
  • Record Type: Publication
  • ISBN: 9784990493981
  • Files: TRIS
  • Created Date: Oct 29 2014 11:38AM