That's good because people trade between trend lines eg. between Fibs lines. If price hits TL it wakes you up to look for entry up or down although you need more confirming indicators for entry. Good for scalping.
The only question is how accurate it draws the trend lines?
Hermes

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Attached is my indicator for trendline alerts.
How to use: attach the indicator and draw any number of trendlines or horizontal lines like usual (works also for existing t/h-lines already on chart). Whenever the Bid price crosses any of them the alert sound (alert.wav) will be played.
Enjoy!