Center out two car lengths (25 feet?) seems a bit tight if you have descents. I want light more than 25 feet out if I hit 25 MPH on the horrible roads I'm on sometimes. I have situations where I can move to avoid a pothole, and be trapped in a converging V of potholes, if that happens with only 25 feet of warning, I will not be able to stop in time and I'm looking at between a pinch flat and a crash.