Questione giuridica chiave
Whether the absence of the supplemental sign 'central parking meter' exempted the defendant from the parking-fee obligation.
Decisione estratta
No. The basic sign requiring parking only against payment already imposed the duty; the missing supplemental sign only indicated the payment method.
Motivazione estratta
The mandatory parking-fee obligation followed from sign no. 4.20. The lack of a supplementary sign did not alter that obligation, and the meter was visibly placed.