Some road engineers in Montgomery, Alabama built a banked turn for a circular clover-
leaf style highway entrance ramp. Unfortunately, they misread the blueprints and built
the turn so that the slope banked outwards instead of inwards. If the road had been
built properly, there road would have have made an angle of 25 with the horizontal,
tilted towards the center of the turn. Instead, the road tips away from the center of
the circular turn at 25 to the horizontal. The radius of the turn is 50 m. In dry
conditions, the coecient of static friction between