What is the primary action required when towing a vehicle?

In the context of towing a vehicle, the primary action required involves safety and ensuring that both the towing vehicle and the towed vehicle are securely connected. Using a safety chain is crucial because it acts as a backup to prevent the towed vehicle from disconnecting completely in case the towing mechanism fails. This helps to avoid potential hazards on the road, such as the towed vehicle breaking free and causing an accident.

Providing clear signals is important for communication with other drivers but is not the primary action that ensures safety during towing. Driving slowly is a good practice while towing, but it isn't a replacement for proper safety measures. Placing a cloth on the towing line does not have a significant safety function and is not a standard requirement for towing. Thus, the emphasis should be on the importance of using a safety chain to guarantee that the towed vehicle remains securely attached during transit.