Characters
People on 'ludes should not drive.
— Jeff Spicoli • Fast Times at Ridgemont High

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker states a plain safety rule in slangy words: anyone on quaaludes should not get behind the wheel. The tone is casual, treating the point as simple common sense rather than a lecture. Impairment and driving are the two things being kept apart.
Context reviewed