In the last fifteen years in the wild animal's habitats in Croatia a network of roads (highways) has been built which fragments the habitat and hinders the migration of animals. In environmental impact studies, one of the main criteria for acceptability of the highway's construction project in terms of fauna is the degree of permeability of the highway for the wildlife. Depending on the configuration of the field, structures such as tunnels and viaducts significantly contribute to a higher level of highway permeability. However, where their construction is not necessary or possible artificial overpasses, green (landscape) bridges are built to mitigate the negative impact of highways on wildlife populations. So far, eleven green bridges have been built in Croatia. The aim of this study was to assess the effectiveness of green bridge Ivačeno brdo on the A1 motorway according to data collected during 10 months of monitoring. Data were collected by indirect monitoring methods: track-pads, camera traps and active infrared (IR) trail monitoring system. Based on the obtained results it can be concluded that the degree of effectiveness of green bridge Ivačeno brdo is at a satisfactory level. It is also possible to assume that the effectiveness will increase with growth and density of plant vegetation on green bridge that has not yet reached the level of development of the surrounding habitat, i.e. there is no continuity of the habitat.