If a chain/rope/cable is used for the connection, what must be present?

When a chain, rope, or cable is utilized for connection, the presence of a 12"x12" white flag is necessary to ensure visibility and safety. This requirement is primarily intended for situations where the connection might pose a hazard, such as when towing. The white flag acts as a warning signal and lets other drivers know about the potential obstruction or the presence of a tow being conducted.

In terms of the incorrect options, a reflective triangle could be used as a safety signal for stopped vehicles, but it does not specifically address the requirement linked to the towing connection. A warning light is also meant for enhancing visibility, especially for larger or slower-moving vehicles but is not mandated in this context. A second chain, while it may provide additional security in certain situations, is not a regulatory requirement in relation to the connection method being questioned. Hence, the specific regulation relating to the use of a chain, rope, or cable mandates the display of the white flag for safety.