Is it possible to put 2 tyres of the same size on the same axle but not the same tread pattern?

Question from visitor, 08/01/2010 :Is it possible to put 2 tyres of the same size on the same axle but not the same tread pattern?
Answer by rezulteo, 08/01/2010 :

Legally, tyres should be the same brand, same size and same usage (e.g. road, snow, all terrain), and the same speed and load ratings. Our technical advice regarding grip, handling and braking is to put 2 identical tyres on the same axle.