What precaution should be taken regarding the tow tractor before connecting the tow bar?

Before connecting the tow bar to the tow tractor, it's essential that the tractor is not moving. This precaution is critical for safety reasons. If the tractor is in motion, it poses a risk of accidents, as any sudden movement of the tractor can lead to improper or dangerous connection of the tow bar. Ensuring the tractor is stationary allows personnel to safely and effectively connect the tow bar without the risk of injury or equipment damage. This practice aids in maintaining a controlled environment while performing the connection, thus fostering a safer tow operation overall.