Actually this is wrong, it's what everyone thinks, but when you take the hazard perception test, if you press a button when you perceive a hazard, you will fail. What actually happens is there are 5 points available per hazard. You have to press the button five times, evenly spaced throughout the due of the hazard, but not starting earlier than the test setters deem appropriate, or you will drop points. It's one of the most bizarrely implemented tests, and needs serious practice to get its arbitrary rules right.