When towing another vehicle with a chain or cable, what color flag must be attached to the chain?

When towing another vehicle with a chain or cable, a red flag must be attached to the chain or cable. This requirement is essential for safety reasons, as it serves to alert other drivers to the presence of the chain or cable, which can pose a hazard if not visibly marked. The red flag enhances the visibility of the towing connection and helps prevent accidents by ensuring that other vehicles have adequate warning of the towed vehicle's presence.

Choosing the correct color for the flag is crucial for compliance with regulations governing towing practices. While the other colors may have their uses in different contexts or signaling systems, the designated requirement for towing setups specifically calls for a red flag to ensure maximum visibility and safety on the road.