The lowest value measured was Glare Ice. Average of 0.19. Where the rubber meets the road friction is absolutely essential. Without it, you can't steer, you can't accelerate and you can't stop. You are always consuming some of the available friction between your tires and the road surface.
More friction is consumed to accelerate, steer, and brake, but some friction is there at all times.
Once the available friction is used by any one or all of these components, the vehicle will lose traction and operator will lose control. This is true of automobiles as well as bikes. The principal difference is that a bicycle is a steer balanced vehicle, which requires that we reserve some of our precious friction for steering, or we will simply fall over. In addition, a single track vehicle is subject to sideways deviations induced by uneven roadway surface, ruts, or ice bumps. The longer this is delayed, the more the cyclist tips, and the larger the steering movement required.