What is the minimum tread depth for car tires?

What does this rule or driving tip mean?Tread channels water away and helps maintain contact with the road surface. Less tread increases the risk of aquaplaning, especially in rain.How to apply this safelyMeasure in several places and all the way around the tire.Check for cracks, bulges, and uneven wear as well.Keep to the recommended tire pressure.Driving lesson and test tipKnow the basic tire checks: pressure, tread, damage, and the valve cap. That is part of safe vehicle knowledge.Remember: below 1.6 millimeters, the tire is legally insufficient; it is better to replace it earlier if grip starts to decline.View the source: Regeling voertuigen, article 5.2.27.