Personally, I am just in the habit of tapping my brakes to let the people behind me know i am slowing down. I like a manual trans in both my cage and bike and have noticed that since most cages are auto trans, most cage drivers are used to seeing brake lights when a car is slowing down. I can be a slow learner sometimes and I have been rearended 3 times in a cage while driving in slow moving, traffic-light to traffic-light driving. I think the fact I was slowing down, but did not have the brakes on contributed to idiots behind me not paying attention. That and stopping for a redlight