Provides a measure of highly modified urbanized WUI (>1 house/2 acres; >0.5 houses/acre) at risk of wildfire penetration. In contrast to Intermix areas, Interface landscapes have more manicured, irrigated and highly modified vegetation, and often it is the structural fuels that contribute significantly to fire spread. Wildfires in this form of WUI are relatively rare, and typically only spread under very extreme fire weather conditions. But due to the high density of assets such as homes, roads, and residential and commercial infrastructure, damage levels from burning can be very high even over small areas.