New Jersey Drivers Practice Test

The answer involves understanding how various substances affect driving abilities. Cannabis is well-documented for impairing cognitive functions, motor coordination, and reaction times, all of which are crucial for safe driving. Research has shown that using cannabis can significantly increase the risk of accidents due to its psychoactive effects.

Tranquilizers, which can include medications intended to reduce anxiety or induce sleep, also impair judgment and coordination. These substances are known to cause drowsiness, reduce alertness, and impair motor skills, making them dangerous for driving.

Considering that both cannabis and tranquilizers individually pose threats to driving safety, it's accurate to say that together they compound the risk. The presence of either substance in a person's system can lead to impaired driving, thus highlighting the importance of being cautious with substances that can affect one's ability to operate a vehicle safely. This makes the selection of both cannabis and tranquilizers the correct choice for identifying common impairing substances alongside alcohol.