Course: Oh, there's a new hazard ahead, where am I gonna go? Mirrors: Anyone behind/besides me I'm gonna smash into as I flick around on my new course? Signal: Better let people know what I'm doing so they have a chance to react to my reactions Brakes: Gotta slow down a little to make that course work? Brake, cause they're more effective brakes AND you get a bonus signal to let people know you're slowing down so they don't rear end you. Then you can... Gear: Go down an appropriate number of gears according to how much you slowed down, where the new course you've chosen goes. Accelerate: Get out of there, briskly. A useful initialism for the learners out there. Have seen a few people on motorbikes that perhaps have given away parts of their safety because of a hazard. Don't give your own safety away and rely on someone else doing the right thing.