Za ugotavljanje vnosa onesnažil v okolje in njihovega vpliva na življenjsko združbo smo na izbranih odsekih cest uporabili pasivno bioindikacijo, in sicer smo na osmih različnih lokacijah za popise pojavljajočih se vrst epifitskih lišajev uporabili seznam iz nemške popisne metode. Rezultati popisov epifitskih lišajev kažejo na uporabnost teh organizmov v bioindikacijske namene ob cestahna lokacijah z večjo gostoto prometa smo evidentirali manj različnih vrst lišajev kot na lokacijah z manjšo gostoto prometa. Na cestnih odsekih z zelo veliko gostoto prometa (povprečni letni dnevni promet > 20.000) so se pojavljale izključno na onesnažen zrak najbolj odporne vrste lišajev, medtem ko so se na odsekih cest z nekoliko manjšo gostoto prometa (povprečni dnevni promet okoli 10.000) bliže robu ceste pojavljale manj toksitolerantne, bolj dušikoljubne vrste epifitskih lišajev. Ob teh odsekih cest so se dlje od roba cestišča (t.j. v 2. in 3. popisnem pasu) začele pojavljati tudi na onesnažen zrak bolj občutljive vrste epifitskih lišajev, ki jih na odsekih cest z zelo veliko gostoto prometa tudi na oddaljenosti 100 m od roba cestišča nismo zabeležili.For the assessment of traffic-originated pollutants input into the environmentand their impact on biocenosis, the passive bioindication was used at eight selected road sections, where mapping of epiphytic lichen flora was implemented according to a German (VDI) method. The mapping of epiphytic lichens implies that lichens can be used in bioindication studies along roadsindeed, at locations with higher traffic density (average daily traffic > 20,000) fewer lichen species were identified in comparison with locations with lower traffic density. At road sections with very high traffic density only epiphytic lichen species most resistant to pollution were recorded, while less resistant but still highly tolerant to nitrogen pollution lichen species were recorded at road sections with moderate traffic density (average daily traffic around 10,000). At those road sections, the lichen species more sensitive to air pollution also begin to occur, which were not recorded at road sections with very high traffic density, not even 100 m away from the roadside
