Clashes generally occur when elements of different models occupy the same space. Pre BIM, clash detection was a very tedious process involving the overlaying of numerous drawings to see whether any conflicts could be identified. With BIM, this process has been automated and improved vastly.
Our clash-detection software is a vital part of our BIM design services. It means mistakes that would in all probability have only been discovered onsite (with high costs and schedule implications) can now be spotted in our offices before anybody starts any actual construction work.
The financial savings and improvements to efficiency brought about by clash detection are enormous.