Final answer:
Placarded vehicles must be parked at least 10 feet away from the traveled portion of a roadway.
Step-by-step explanation:
Placarded vehicles should not be parked within 10 feet of the traveled portion of any roadway. This regulation ensures that vehicles carrying hazardous materials are kept at a safe distance from the main portion of the roadway to prevent any potential accidents or hazards to passing traffic. It is crucial for the safety of all road users that these guidelines are followed precisely. Placarded vehicles must be parked at least 10 feet away from the traveled portion of a roadway.