Quote from Smart Money:
OK...I can definitely answer this one.
I'm saying all this from my experience and how I use them. Don't know how you trade.
First off, bollinger bands need to be adjusted in width to where price almost never goes outside of it, but it touches it. In your picture, price is on the topside of the bollinger band, so the band isn't really a true top or barrier. Adjust the BBs so price hardly ever gets outside of them.
Next, realize the BB's move. You can think of them being pushed out of the way by price. Or you can think of the price as sliding along the BBs. But here's what you need to realize...price can hit an upper BB, and then they can move up together. That means shorting doesn't always work in that scenario. Likewise, price can hit the lower BB and they can move down together...so it's not always a place to go long.
But they can be. If price slides along a bollinger band for a while, I've noticed that when it comes off of one, it moves away from it nicely in most cases. So if price hits an upper Bollinger band, don't even think of shorting until it comes off the BB, and even then it can come right back up and hit it again. But...if price hits a BB, and slides along it for a while, and then comes off...then you have better odds.
Also...timescale is relavant. I think you'll find BBs more useful if you watch them in the timescale above the one you trade. If you're a day trader, look at multiday BBs. They can tell you where the trend should be for the day when price is moving away from them.
And finally...BBs by themselves have a limited use. But they are powerful if they are part of a pair or trio of decision making indicators. Decide that you will only trade when two things are happening simultaneously, and you're increasing your odds of success.
SM