Questione giuridica chiave
Whether the irregularly placed speed-limit sign was null and therefore not binding.
Decisione estratta
The sign was irregular but not so manifestly defective as to be null; it remained binding under the trust principle.
Motivazione estratta
A speed-limit sign that is clear and visible to a normally vigilant driver must be respected even if placed irregularly, unless the defect is particularly manifest and creates no protected appearance for other road users.