What is the threshold for significant structural damage in a vehicle crash?

Significant structural damage in a vehicle crash is typically identified by major auto deformity that exceeds a specific measurement, which in this case is greater than 12 inches. This level of damage usually indicates a serious impact that has affected the integrity of the vehicle’s frame or major structural components, potentially leading to safety issues or vehicle performance problems. Such significant deformity can compromise the vehicle's ability to protect its occupants in subsequent collisions and suggests that the vehicle may not be safe to operate without substantial repairs.

The other options reflect lesser degrees of damage that do not typically warrant a classification of "significant structural damage." Minor dents, scratches, and damage limited to the front bumper would not necessarily impact the vehicle's structural integrity. These types of damage may still require repairs but are not indicative of the serious level of impact associated with major deformity.