What color flag must be attached to the chain when towing another vehicle?

When towing another vehicle, the correct flag color that must be attached to the chain is white. This requirement is based on safety regulations that aim to enhance visibility and alert other drivers on the road that a vehicle is being towed. A white flag is universally recognized as a signal for caution, which helps in preventing accidents by indicating the presence of the towing setup.

The importance of using a white flag lies in its ability to easily stand out against various backgrounds, thereby ensuring that other motorists can quickly discern the situation. This helps to promote safer roadway conditions for everyone involved, including both the driver of the towing vehicle and surrounding vehicles.

In contrast, other colors like red, blue, or green are not standard or recognized for indicating a tow. Each of those colors may signify different meanings in various contexts, such as warnings or notifications, but they do not serve the same purpose as the white flag in this specific scenario. Therefore, adhering to the use of a white flag is essential for compliance with towing regulations and for fostering safe driving practices.