When converting from SSR to standard tyres, the driver must be informed that he no longer has flat-running tyres.

If there is no spare wheel in the vehicle, the driver must be informed of the possible consequences.

SSR tyres should not be mixed with standard tyres on the same car - even if paired on the axles (in exceptional cases, a normal tyre can be used for a limited period and distance. Then of course, the driver has to be clearly advised that normal tyres do not have the run-flat characteristics of SSR).