Books
My primary motivation behind buying a car, despite the scarcity of my funds, was that I refused to be driven around town in a car with red and blue lights on top. Nothing slows down traffic like a cop.
— Stephanie Meyer • Twilight

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker explains buying a car despite limited money by refusing to ride in one with police lights. The closing remark links that refusal to the effect of a police car on traffic. The humour makes this particular inconvenience sound strong enough to outweigh the financial difficulty.
Context reviewed