If BLACK > RED > YELLOW > GREEN
In upward trend , if green(fastest ) crossunder YELLOW or RED or both of them , you can close the position . Dont wait the Downward Trend.
Lengths of EMAs are based on Fibonacci numbers ( 8,13,21,34) , if you want, you can change it based on your strategy.
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.