Type 3 Barricades What’s the Difference?

If one was searching for type 3 barricades they may wonder, what is the difference between these traffic barricades?  For example there are type 1 barricades, type 2 barricades and then type 3.  There are a couple difference but there is one that is the most obvious.

A type 3 barricade has 3 boards across it, a type 2 has two boards and a type 1 has one board.  Type 3 are usually wider than type 1 or two.  I also notice that type 3 is commonly used to block off roads.