The Motorcycle Safety Foundation has published an online tool to help you train your mind to look for and recognize, both road signs and collision traps hazard.
An experienced rider, I tried my hand at each of these. While scoring 100% on the signs test, I performed miserably on the collision traps hazard. The test gives you just a few seconds to look at a scene, and then answer a question. The nice part is that they give some really good feedback when you pick the wrong answer.
I encourage you to take the Rider Perception test. I know I'll be going back again to see if I can improve my score.