What is the maximum play the towing fork may have in the bearing bushes in towing direction?

The towing fork must have no noticeable play in the bearing bushes in the towing direction to ensure safety and stability while towing. Any play or looseness could lead to unstable towing, increased wear, or even detachment of the trailer. Therefore, the rule emphasizes that the connection should be tight and secure without visible movement, which is why the correct answer is "No noticeable play." This ensures a safe and reliable towing connection according to German traffic regulations.