In order to stop drunk drivers, ad agency Publicis Brussels decided to literally stop them with the Alcohol Barrier. Positioned at the exit of a club's parking lot, the barrier only lets sober people through. In order to get past the barrier, drivers were required to blow into a breathalyzer which only lifted the gate if the test was negative. If successful, the barrier glowed green and allowed you to pass. Otherwise, it glowed a bright red.
The barriers were installed in Belgium's most popular club called ‘Carré’ during their 22nd anniversary event. Since 33 percent of those killed in automobile accidents during weekends are under 25, The barrier was erected to nip the problem in the bud. The Alcohol Barrier successfully diverted many drunk drivers with 10 percent of drivers failing to get past the barrier.