Questão jurídica principal
Whether the unlawfully placed 60 km/h sign could be enforced against the driver.
Decisão extraída
No; a prohibition sign binds only if it is clear, visible, and placed in accordance with the rules, which was not the case here.
Fundamentação extraída
The sign was positioned on the left side at an impermissible distance and could not be seen in oncoming traffic, so no punishable disregard of that sign was possible.