Quote from NoDoji:
These lines simply act as a framework. The amount of time it takes for price to approach either line in a given time frame is also a factor, because as more time progresses the price level indicated by the line grows nearer (pullbacks to trend lines) or farther (excursions to channel lines), meaning that key S/R levels in longer time frames will eventually come into play.
In "orderly" markets, these lines tend to hold on the initial approach; in fast markets (surrounding news events and key breakouts) these lines are meaningless in small intraday time frames.
My main concern is how price reacts to either line. There are particular patterns I watch for when price touches these lines that can trigger a new trade or trigger the close of an existing one for me.
I will trade with-trend or counter-trend depending on the contextual price environment. In a strong trend I only trade with-trend.