I was on a week ride with a few friends, leading the group, into Ohio to ride the Windy 9. At one point, I was looking for a route number, following a cage. I saw two roads ahead with route numbers, and looked down at my phone/gps, when suddenly the cage in front decided to stop and put their left hand turn signals on (After stopping of course) As I looked up I saw the rear bumper of the car looming closer, I jammed the brake on and turned slightly to the right to avoid the car. The bike stopped, as I told my riding buds, on a quarter and gave me change. These things stop GREAT!!. Hope I don't have to use it like that again, but nice to know they do stop. By the way the Windy 9 are some great roads to ride. We then went south and rode through West Virginia, Kentucky, Tennessee, Maryland, Virginia, North Carolina and Pennsylvania.(Not in that order) Cut the week by a day because of constant downpour. Still a good week.