What must be attached if a chain, rope, or cable is used for towing?

When towing with a chain, rope, or cable, a 12 square inch white flag must be attached to ensure visibility and alert other drivers to the situation. The purpose of the white flag is to serve as a warning, indicating that the vehicle is being towed, which is critical for the safety of both the towing and towed vehicles as well as surrounding traffic.

While flags and warning devices are essential for towing, a white flag specifically is recognized as a symbol of a hazard or special condition. This helps in preventing misunderstandings on the road about the towing situation and enhances safety. Using the correct signaling device is essential for compliance with traffic regulations, as it informs other road users to exercise caution around the towing vehicle.

The other options such as a red flag, reflective triangle, or warning sign may have their uses in different contexts or specific requirements, but in the case of towing with a chain, rope, or cable, the appropriate and required signaling method is the 12 square inch white flag.