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This guide begins by describing the problem of drunk driving and reviewing the factors that increase its risks. It then identifies a series of questions that can help analyze local drunk driving problems. Finally, it reviews responses to the problem of drunk driving and examines what is known about the effectiveness of these responses from research and police practice.
Various terms are used to describe the problem: drunk driving, drunken driving, drink driving, driving under the influence (DUI), driving while intoxicated (DWI), and operating while intoxicated (OWI) are among the most common.
The Century Council, a non-profit organization funded by U.S. alcohol distillers, publishes a sourcebook on combating drunk driving that also surveys relevant research and practice (Century Council 2003) [PDF. The sourcebook can be accessed online at www.dwidata.org
Simply put, drunk driving is a police concern because alcohol increases the risk that drivers will get in traffic crashes and kill or injure themselves or others. Alcohol impairment is the primary factor in traffic fatalities. 1 In the United States, where drunk driving is among the most common types of arrest made by police, the number of alcohol-related crash deaths is roughly the same as the number of homicides. 2 In addition, vehicle crashes are the leading cause of death in young people ages 15 to 20; many of these are alcohol-related. 3
It is important to bear in mind that alcohol-related crashes and crashes caused by drunk driving are not necessarily the same thing. Alcohol-related crashes are typically defined as those in which a driver or injured pedestrian has any measurable blood alcohol, many of which will fall below legal levels for drunk driving.
Drunk driving is one of a number of problems police confront that relate to impaired and dangerous driving. Others, which may require separate analysis and response, include:
Much, but not all, of the information in this guide also pertains to the problem of driving under the influence of other controlled substances.
Drunk driving harms individuals and communities in many ways.
One of the reasons drunk driving is of such concern to police is that it is an offense committed by a broad spectrum of the population, including those who are otherwise generally law-abiding. An estimated one-fifth to one-fourth of U.S. drivers admit to having driven after drinking at least once within the past year, 4 and about five percent estimate that they were legally impaired. 5 Drunk drivers come from all parts of the population spectrum, but are more likely to be male,6 white or Hispanic,7 between 25 and 44 years of age, 8 unemployed or working class,9 and unmarried.10 Drunk drivers are more likely to be heavy drinkers or to have drinking problems. 11 Drinking drivers under 21 years of age are about twice as likely as older drivers to be involved in fatal vehicle crashes. 12
Recent roadside surveys in the United States indicate that about three percent of drivers at any particular time are legally impaired. On weekend evenings the number of drunk drivers rises significantly: about eight percent of all drivers have blood alcohol concentrations greater than .05, and an additional nine percent of drivers have had at least one drink, meaning that on weekend evenings around 17 percent of all drivers are operating their vehicles under the influence of at least some alcohol. 13
Blood alcohol concentration is typically measured as a ratio of grams of alcohol per deciliter of blood or per 210 liters of breath.
Considering the high traffic volume during this period, it is clear that there are a lot of impaired drivers, especially compared to the limited law enforcement resources that are available to investigate suspected incidents of drunk driving.
Although the general public and the police are perhaps most concerned about wholly innocent persons who are killed in alcohol-related crashes, it is in fact the drunk driver or his passenger who is most likely to be killed.14 In recent years, significant reductions have been achieved in the number of young drivers killed in alcohol-related crashes, due largely to higher legal drinking ages, greater licensing restrictions on young drivers, and stricter enforcement of juvenile drunk driving laws.15
For further information about how to develop a comprehensive approach to juvenile drunk driving, see Strategies for Success: Combating Juvenile DUI at www.nhtsa.dot.gov/people/injury/alcohol/juveniledui (National Highway Traffic Safety Administration, Police Executive Research Forum, and U.S. Office of Juvenile Justice and Delinquency Prevention, 1999 ).
Alcohol is a primary factor in a large number of fatal traffic accidents. In fact, the number of U.S. alcohol-related traffic deaths is roughly the same as the number of homicides. Milford (Ohio) Community Fire Department
By most estimates, although repeat drunk drivers comprise a relatively small proportion of the total population of drivers, they are disproportionately responsible for alcohol-related crashes and other problems associated with drunk driving.16 In fact, anywhere from one-third to three-fourths of drivers arrested for drunk driving have previously been charged with the offense.17 Those who drink and drive at least twice per month account for about 90 percent of all drunk driving trips. 18 In the United States, one-third to one-half of those charged with drunk driving will be charged with it again in the future. 19 However, even though repeat offenders are disproportionately involved in traffic crashes, most alcohol-related crashes are caused by drivers who have not previously been charged with drunk driving, so police must pay attention to both repeat and first-time offenders.
Perception and motor skills are impaired by a blood alcohol concentration of as low as .05, which is typically two or three drinks for the average adult. 20 Although drivers with blood alcohol concentrations of .15 and above are much more likely to be involved in serious or fatal traffic crashes, 21 , drivers with lower concentrations remain at a substantial risk for less serious crashes. 22 In addition, many drivers are impaired by alcohol in combination with other controlled substances. Low blood alcohol concentrations of obviously impaired drivers are often due to the presence of substances other than alcohol.23
Although blood alcohol concentration affects individual drivers differently, on average, the risk of a driver getting in a serious vehicle crash roughly doubles when his blood alcohol concentration reaches .05, i ncreases ten-fold at .08, twenty-fold at .10, and by a factor of hundreds at .15 and above (Ross, 1992).
A relatively high percentage of drunk driversperhaps one-third to one-halfconsume their alcohol in a licensed establishment such as a bar or restaurant. 24 Nearly one-half of drivers with measurable levels of alcohol in their systems claim to have been drinking at the home of a friend, making social hosts an important factor in controlling drunk driving. 25 In addition, a significant amount of drinking is done in vehicles themselves, especially by underage drivers who are not permitted in licensed establishments and by drivers with serious alcohol problems. 26
Understanding the factors that contribute to drunk driving in your jurisdiction can help to frame local analysis, to identify effective remedial measures, to recognize key intervention points, and to select appropriate responses.
Cultural and Economic Factors
Drunk driving is very much the result of a cultural norm that emphasizes drinking alcohol as a form of entertainment and driving as both transportation and entertainment. 27 Cultural drinking habits also shape drunk driving patterns. For example, drunk driving will be more concentrated on weekend nights in countries where such nights are considered prime time for heavy drinking. The extent of drunk driving also depends, obviously, on the availability of vehicles, so it is less likely in societies and communities where vehicles are prohibitively expensive.
Low Risk of Apprehension
Perhaps the single most significant factor in explaining why people drive while impaired is that they believe that there is little risk that they will be caught by policeand statistically, they are correct. By some estimates, the average drunk driver will drive while impaired between 80 and 2000 times for every time he is apprehended, depending on the enforcement capacity of the local police. 28 In fact, most drivers believe they are more likely to be involved in a crash than they are to be stopped by police.29
Even the most committed police agencies and officers can stop or arrest only a very small percentage of the impaired drivers who are on the road at any one timeprobably less than one percent. There are several reasons this is so.
The low probability that they will be stopped or arrested by the police on any particular trip undoubtedly leads many drivers to conclude that they can drink and drive without getting caught.
Detecting drunk driving is not as easy as it might seem. Those without specialized training in detecting alcohol impairmenteven medical professionalsare notoriously poor at estimating alcohol impairment. For police, detecting drunk driving typically requires two separate judgments: first, that a vehicle is being operated by an impaired driver; and second, that the driver is impaired by alcohol or another controlled substance. Each judgment is in turn subject to two kinds of errors: first, that the driver is impaired by alcohol when in fact he is not (false positive); and second, that the driver is not impaired by alcohol when in fact he is (false negative).
Compounding the difficulty of estimating impairment is the fact that some police officers try to arrest only those drivers who they believe have high blood alcohol concentrations, either because they prefer to prosecute only strong cases or because they do not want to be criticized for wasting scarce police resources on borderline cases. Consequently, some officers systematically fail to arrest impaired drivers because they are only searching for the most impaired.
Although police want to create the impression that all drunk drivers will be arrested, in reality only a small percentage of drunk drivers on the road at any particular time will in fact be stopped or arrested. Drunk Busters of America
Serving obviously intoxicated guests and patrons increases the risk of drunk driving, especially when drinking occurs at a location that most guests and patrons must drive to. Absent adequate enforcement of the laws that prohibit serving intoxicated patrons, overserving is notoriously common. The combination of the social pressure put on servers by patrons and the economic pressure to maximize profit can often overwhelm a servers better judgment.
Perhaps obviously, drunk driving is more common where licensed establishments are located far from where people live and work. Accordingly, drunk driving is likely to be more common, proportionate to the number of drinkers, in rural or suburban settings. Where people can easily walk or take public transportation in order to drink at a licensed establishment, drunk driving is proportionately less common.30
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