Key legal question
Whether the unlawfully placed 60 km/h sign could be enforced against the driver.
Extracted holding
No; a prohibition sign binds only if it is clear, visible, and placed in accordance with the rules, which was not the case here.
Extracted reasoning
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.