Question juridique clé
Whether the appellant's right to be heard was violated because he was not allowed to comment on the appellate court's legal qualification of his mistake.
Solution extraite
No violation occurred; a new hearing was unnecessary because the change in legal characterization did not affect his ability to defend himself.
Motifs extraits
The decisive questions remained whether he mistook the permissibility of driving and whether that mistake was avoidable with due care; the parties' factual and legal arguments were essentially the same under either characterization.