In my personal opinion and experience, trend lines never work. No matter what the time frame you are using. One of two things will happen, either you try to predict future trend lines or you try to trade existing trend lines. If you try to predict trend lines, you will get burned so many times, you losses will out weight your profits. And if you try to trade existing trend lines, by the time you are ready to get in, the trend lines either brakes or is never reach. There are some exception for long term trends but for the most part, I don't rely on trend lines. Thats just my personal opinion.