How it works: The principle of the volume zone oscillator was used here, but instead of closes > closes[lookback] (price momentum) was used RSI, if RSI > 50 it is a positive momentum and we get + volume value, otherwise - volume Instead of ema's here is a Volume-Weighted Average Price (VWAP) which gives us such shape of TVI line that in general less sensitive to the pullbacks inside a trend.
This indicator is good for catching and following trends.
You can use alerts as well for take values of trend (-1,1) from 1-10D timeframes