DI lines in ADX indicator

I am using ADX indicator and am really liking its versatility. One thing I can’t ascertain on the net is whether or not the position of the DI lines in relation to the 20 are of relevance as they are for ADX line.

I did read on one website that if the DI lines cross while below 20 to ignore. This seems odd as they tend to cross there a lot.

tks