A test given by law enforcement (police officers) to drivers of motor vehicles who are under suspicion of being intoxicated. Usually administered on the side of the road at the scene where the vehicle has been stopped. The driver is usually asked to perform a series of tests that will reveal dexterity such as walking toe to toe on one line, closing one’s eyes and touching one’s nose with the tip of the index finger of each hand, saying the alphabet backwards, etc.