In the case of a first registration until 1.5.2009 it is necessary to add a safety surcharge to the maximum speed entered in the vehicle registration certificate Part I in order to determine the height speed to be maintained by the tyre. From the above date this surcharge is no longer necessary. But what has changed exactly? If the registered height speed already contains the safety surcharge or if it is determined differently, only the safe speed is determined. or must the tyres now have the reserve by changing the test conditions for the tyres?