Question

If the centripetal and thus frictional force between the tires and the roadbed of a car moving in a circular path were reduced, what would happen?

Answer 1

For PF STUDENTS:  The car would begin to move in the direction it was headed in a straight line.

Answer 2

As the question states the reduction of the centripetal force is a reduction of the frictional force. By reducing these forces (they are the same force) the tires might not follow the circular path, this is the car could slip because the force would be insufficient to keep the circular path.