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The above figure and photo show the installation specifications. The longitudinal width, transverse width and depth are approximately 150 mm, 350 mm and 12 mm, respectively. The rumble strip is installed between the double yellow-centerline markings (no overtaking). The photo at left below shows installation on roads. Currently, rumble strips are installed only at sections with double yellow-centerline markings (no-overtaking), out of safety concerns regarding rumble strip installation. Immediately after strip installation, the yellow lines look like zippers, but as the photo on the right side below shows, lines are painted upon completion. |
Installation | Immediately after installation | Rumble strips in service |
Installation costs about 1,500 yen per meter. This is less than one-third the cost of installing jiggle bars and less than half that of installing center poles. We expect head-on collisions to be reduced by more than 30%, according to our research. |
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The above figure and photo describe the specifications of installation on one-lane no-passing sections. While the conventional specification with 350-mm transverse width applies to two-lane no-passing sections, this specification adopts 150-mm transverse width. Test-driving was carried out in fiscal 2003 on test courses, and test installations were made on National Highways 5 and other national highways in fiscal 2004. In fiscal 2005, installations started throughout Hokkaido. |
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The above figure and photo describe the specifications of rumble strips at shoulders. Note that a shoulder width of more than 1.2 m is recommended. This was determined from riding tests by cyclists on test courses with various shoulder widths. Installation of rumble strips immediately before structures such as narrow bridges and tunnel mouths is regarded as effective, because deviations from lanes at those structures can be extremely dangerous. |