Article Text

Download PDFPDF
Effects of high-profile collisions on drink-driving penalties and alcohol-related crashes in Japan
  1. Shinji Nakahara1,
  2. Masao Ichikawa2
  1. 1Department of Preventive Medicine, St. Marianna University School of Medicine, Kawasaki, Japan
  2. 2Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan
  1. Correspondence to Shinji Nakahara, Department of Preventive Medicine, St. Marianna University School of Medicine, 2-16-1 Sugao, Miyamae-ku, Kawasaki, Kanagawa, 216-8511 Japan; snakahara{at}


Background Japanese road traffic law was amended in 2002 and 2007 to increase the penalties for drink-driving in response to media coverage, publicity campaigns, and debates following high-profile alcohol-related motor-vehicle crashes in 1999 and 2006.

Objective To test the hypothesis that the proportion of crashes involving drink-driving started to decline before the law amendments, because of changes in social norms and driver behaviour after the high-profile crashes.

Methods In order to assess the impact of the cases in 1999 and 2006, time-series analyses were used to examine the trends in the proportion of crashes involving drink-driving, and whether there were abrupt changes in the level or slope at the expected time points, using monthly police data for the period between January 1995 and December 2008.

Results In 1999, the proportion of alcohol-related fatal crashes in which the driver had a blood alcohol concentration (BAC) ≥0.5 mg/ml started to decline with a slope change of −0.09 percentage points per month (95% CI −0.15 to −0.03) but no level change, whereas there were no changes for drivers with a BAC <0.5. In 2006, the trends for drivers with a BAC ≥0.5 or <0.5 showed significant level declines of −3.1 (−5.0 to −1.2) and −1.7 (−2.5 to −0.9) percentage points, respectively, but no slope changes.

Conclusions Media coverage of high-profile crashes, and subsequent publicity campaigns and debates might have altered social norms and driver behaviour, reducing the proportion of alcohol-related crashes before the introduction of more severe penalties for drink-driving.

  • Road traffic injuries
  • media coverage
  • high-profile crashes
  • social norms
  • alcohol/drugs
  • legislation
  • media
  • MVTC

Statistics from

Request Permissions

If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.


  • Funding This work was supported by a Grant for Research on Global Health Issues from the Ministry of Health, Labour and Welfare, Japan.

  • Competing interests None.

  • Provenance and peer review Not commissioned; externally peer reviewed.