How much oil has to be on truck to be placarded?

A truck must be placarded for transporting oil if it carries 1,001 pounds (approximately 119 gallons) or more of oil, according to U.S. Department of Transportation regulations. For shipments of certain hazardous materials, including specific types of oil, different thresholds may apply, so it's important to check the specific regulations relevant to the material being transported. Proper placarding ensures compliance and safety during transport.