Questão jurídica principal
Whether the speed-limit signage could be challenged as materially unlawful or inappropriate
Decisão extraída
The driver was not entitled to question the material legality or expediency of duly established speed-limit signage.
Fundamentação extraída
Formally valid traffic signs are binding on road users; only in narrow exceptional cases of unclear or insufficiently visible signage may their effect be doubted. None of those exceptions applied.