text: traction on dry surfaces were the 
  only consideration in the design of tires, the 
  result would be a soft rubber tire of extreme 
  width 
  to create a large footprint and reduce 
  surface shearing stresses, e.g., driving tires on 
  a drag racer. However, such a tire has many 
  other characteristics which are undesirable 
  such as high rolling friction, 
  large size, poor 
  side force characteristics, etc. 
  
  If high 
  
  When the runway has water or ice on the 
  surface, the maximum value for the coefficient 
  of friction 
  is reduced greatly below the value 
  obtained for the dry runway condition. When 
  water is on the surface, the tread design be- 
  comes of greater importance to maintain con- 
  tact between the rubber and the runway and 
  the 
  prevent a film of water from lubricating 
  surfaces. When the rainfall is light, 
  the peak 
  value for friction coefficient is on the order of 
  0.5. With heavy rainfall 
  is more likely 
  that sufficient water will stand to form a liquid 
  
  it 