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Motor Vehicle Injury – Alcohol-Impaired Driving: 0.08% Blood Alcohol Concentration (BAC) Laws

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What the CPSTF Found

About The Systematic Review

The CPSTF finding is based on evidence from a systematic review of 9 studies (search period through June 2000). The review was conducted on behalf of the CPSTF by scientists from CDC’s Division of Unintentional Injury Prevention with input from a team of specialists in systematic review methods and experts in research, practice and policy related to motor vehicle injury prevention.

Context

As of February 2015, all 50 states, the District of Columbia, and Puerto Rico have 0.08% BAC laws.

In support of .08 BAC laws, the U.S. Congress included a provision in the Fiscal Year 2001 Department of Transportation and Related Agencies Appropriations Act that required states to implement 0.08% BAC laws by October 2003 or risk losing federal highway construction funds.

Summary of Results

Nine studies qualified for the systematic review.

  • Fatalities due to alcohol-related motor vehicle crashes: median decrease of 7% following implementation of the law (interquartile range: 15% to 4% decrease; 7 studies)

Summary of Economic Evidence

An economic review of this intervention did not find any relevant studies.

Applicability

Results should be applicable to all drivers in the U.S., though the review did not find information on the effectiveness of these laws in various subgroups.

Evidence Gaps

CPSTF identified several areas that have limited information. Additional research and evaluation could help answer the following questions and fill remaining gaps in the evidence base. (What are evidence gaps?)

Research Issues – Laws

  • How do variations in enforcement levels influence the effectiveness of laws to reduce alcohol-impaired driving?
  • What are the independent effects of publicity on the effectiveness of laws to reduce alcohol-impaired driving?
  • Does public compliance with new laws change in a predictable manner over time?

General Research Issues

The following outlines evidence gaps for reviews of these interventions to reduce alcohol-impaired driving: 0.08% Blood Alcohol Concentration (BAC) Laws; Lower BAC Laws for Young or Inexperienced Drivers; Maintaining Current Minimum Legal Drinking Age (MLDA) Laws; Sobriety Checkpoints (archived); Intervention Training Programs for Servers of Alcoholic Beverages (archived).

General Questions
  • How do interventions to reduce alcohol-impaired driving interact with each other (e.g., 0.08% BAC laws and administrative license revocation)?
  • What effects do these interventions have on long-term changes in social norms about drinking and driving?
Applicability

Questions remain about possible differences in the effectiveness of each intervention for specific settings and subgroups. For example:

  • Are these interventions equally effective in rural and urban settings?
  • Are these interventions equally effective when applied to populations with different baseline levels of alcohol-impaired driving?
  • Does targeting publicity efforts to specific subpopulations (e.g., young drivers, ethnic minorities, men) improve the effectiveness of interventions to reduce alcohol-impaired driving?
Other Positive or Negative Effects

Few other positive and negative effects were reported in this body of literature. Further research about the following questions would be useful:

  • What proportion of youths charged with violating zero tolerance laws had BAC levels elevated enough to warrant a more serious drinking-driving offense?
  • Do interventions to reduce alcohol-impaired driving reduce other forms of alcohol-related injury?
Economic Evaluations

Little economic evaluation information was available. Research is warranted to answer the basic economic questions:

  • What are the cost-benefit, cost utility, and cost-effectiveness of interventions to reduce alcohol impaired driving?
Barriers to Implementation

Several of the interventions reviewed face barriers to effective implementation. Research into the following areas may help to overcome these barriers:

  • What role can community coalitions play in removing barriers to implementing interventions designed to prevent alcohol-impaired driving?
  • What are the most effective means of disseminating research findings about effectiveness to groups that want to implement interventions?
  • What forms of incentives (e.g., insurance discounts) are most helpful for increasing management and owner support for server intervention training?
  • How can the costs of interventions to prevent alcohol-impaired driving be shared or subsidized?
  • What situational and environmental influences help or hinder the implementation of server intervention training?

Study Characteristics

  • Each study evaluated 0.08% BAC laws in one or more of the 16 states that implemented the laws before January 1, 1998.
  • Studies reviewed fatal injury crashes (8 studies) and fatal and nonfatal injury crashes (1 study).
  • All of the included studies analyzed data from police incident reports of crashes occurring on public roadways.
  • Post-law follow-up times for individual state laws ranged from 1 to 14 years (median, 5 years).
  • The states studied were geographically diverse with varying population densities.