Possible Clues:

• Breathalyzer test target, for short
• Traffic violation, for short
• Reason for points on a license
• Cause of some weaving, for short
• Sobriety-checkpoint offense, briefly
• Bad thing to have on a record, in brief
• Hwy. infraction after a night at the bar, maybe
• Cause of a lost license, briefly
• Motorist's crime, for short
• Imbiber's hwy. offense