Because huge money is being thrown at markets on daily basis & quite a big chunk of this money is short term speculation emotions will be present, especially so whenever there isn't a strong trend present. So instead of using 1 average, I would suggest using 2 & not pay attention so much to ever so popular crossover signals (TA gurus love that), but to the times when distance between 2 averages starts getting narrower. A typical example would be price going from 100 to 110 distance between 2 averages is 5, then price goes from 110 to 120 distance between averages is 4, next price goes from 120 to 127 distance between averages is 2.5. That is 1 of various ways to implement averages to spot weakening price action or vice versa to see strengthening price action.
Here is a visual example of weakening price action in OIL, if you look at the histogram pattern (which basically is a visual representation of distance between 2 averages) although price keeps going higher & higher histogram peaks are getting smaller & smaller indicating that price action is weakening & that any time soon there MAY be a correction of prices. Of course finding a point in time to trade that signal takes a lot of skill, commitment & money.
<img src=http://www.elitetrader.com/vb/attachment.php?s=&postid=1961743>