Trends are like volatility, they go from periods of trendlessness to trendyness and back. My favorite way to measure a trend is with the ADX, and a very low ADX can tell you just as much as a very high one. When short term intraday (15, 5minute) ADX value's get low, this is a time to be cautious as many things will fail. Though it is a time to be cautious, its also a period of time to be alert as the market will likely swing out of this trendless period and give some nice moves as it swings back to a trending state for a short period of time.
Brandon
Brandon