In the garage in Apeldoorn the mechanic swaps a flat tyre for the emergency wheel from the boot, which has a different size designation than the other three tyres. Is that allowed?
Yes — the emergency or spare wheel is the exception to the same-size-designation-per-axle requirement
No — the four tyres must have exactly the same size designation, without exception
Explanation
False — the book explicitly names an exception for the emergency or spare wheel (Book p.204).