The National Highway Traffic Safety Administration (NHTSA) studies the effectiveness of DUI counter measures and publishes reports on the findings. You may be surprised to learn that one of the most effective deterrents to driving under the influence is DUI checkpoints. You probably know what a checkpoint is; most likely, you have probably also driven through one.
In what is described as high-quality studies, the NHTSA reports that publicized checkpoints reduce alcohol-related fatalities, injuries, and property damage crashes each by about 20%. You might think that the police want to keep the locations of their DUI checkpoints a secret in order to snag unsuspecting drivers but that is not correct. According to the NHTSA, the purpose of the checkpoints is not to increase arrests but to deter drunken driving by increasing the perceived risk of getting arrested for DUI. To that end, the effectiveness of checkpoints depends on well-publicized and highly visible checkpoints conducted on a regular basis.
In one particularly compelling study, a year-long program of weekly checkpoints in two West Virginia counties resulted in a 70% fewer drivers with BACs over the drunken driving threshold in those counties as compared to West Virginia counties that did not operate the weekly checkpoints.