In New Jersey, the standard BAC limit for alcohol intoxication is 0.08 percent. A driver who has a BAC at or above that level is deemed to be driving under the influence. Commercial drivers, such as truck drivers, bus drivers, or limo drivers, are subject to a lower limit of 0.04 percent while on duty. Drivers under the age of 21 are held to a zero-tolerance standard. If a driver under the age of 21 has any detectable alcohol in their system, they can be charged with a DUI.