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Surface / Area
Qualitative evaluation
Green roofs, fields and cultivated land; roof surfaces without the use of uncoated metals (copper, zinc and lead), terrace surfaces in residential and similar commercial areas
non-hazardous
Roofs with usual proportions of uncoated metals, cycle tracks and footpaths in residential areas, calm traffic areas; lawns and car parking without frequent vehicle changes; as well as lightly used vehicle areas (up to DTV 300 vehicles); streets with DTV 300 - 5,000 vehicles, e.g. access roads, residential and district streets; airport tarmac; roofs in commercial and industrial areas with significant air pollution, see DWA-A138.
tolerable
Lawns and streets in commercial and industrial areas with significant air pollution; for special zones see DWA
intolerable
Source DWA-A138, DTV = average daily traffic intensity