On any given day, there could be hazardous materials crossing the area by land or by air. However, just how many and how often remains unknown to even emergency personnel.Enter the South Central Homeland Security Region Hazardous Materials Commodity Flow Study, which was a topic at the Barton County Local Emergency Planning Committee quarterly meeting last week. Barton County Emergency Manager Amy Miller said the project will provide data on such cargo transported through the 19-county region which includes Barton County, as well as spills and storage.