The Cracked View: When Do You Need Windshield Replacement?

As a car owner, few things can be as vexing as a cracked windshield. It's the sudden imperfection that's right in your line of sight, something you can't ignore no matter how you squint, adjust your seating, or hold your mouth just right. When do the unsightly and seemingly innocuous cracks or chips actually reach a point of no return? When should that windshield be replaced without question?  The Anatomy of a Crack