There are two types of clashes: hard clash and clearance.

• A hard clash is a physical clash between elements. If the graphic elements from two different objects intersect, then a hard clash is reported.
• A clearance checks for a clash taking into consideration the added area around the physical element. If any part of a graphic element from one object lies within a specified distance of another object, but does not intersect any of the graphic elements of that object, then a clearance is reported.