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Installation (2002.7 - 2003.11)
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After the first installation by the Hokkaido Regional Development Bureau on National Highway 5 in Yakumo Town in July 2002, the rumble strip installation length reached about 39 km on 24 sections by November 2003, a period of one year and four months.
On these 24 sections, 42 head-on collisions had taken place in the two years before installation. This was reduced to 19 head-on collisions in the two years after installation a 55% reduction.
The data are based on figures as of Dec. 31, 2004. The number of accidents before the installation is figures for the two years before the installation at respective sections. The number of accidents after the installation is an estimate, because a full two years had not passed after installation.
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