Thesis entitled "˙Evaluation of motorway's spatial impact in context of agricultural land protection" stresses the issues of agricultural land sealing, which failed to be reduced despite the relevant legislation. The thesis that for investigates the reasons for continuous sealing of the agricultural land in inappropriate methodology of spatial assessments (scenarios, environmental assessment), which evaluate the impact of spatial interventions on the agricultural land. Detailed overview of the methodology for spatial impact assessment on the agricultural land revealed that the existing method leans on quasi-quantitative estimations with a high degree of subjective evaluation. The method of impact evaluation for agricultural land was therefore recognized as less appropriate and more affective alternatives were considered. The analysis of the method adequacy showed that the most appropriate methods of spatial impact evaluation in terms of agricultural land protection are those with multi-criteria approach, namely SMARTER method. The SMARTER method was tested on implementation of the section of the third corridor state motorway. This exercise proved the scenario F5 to be most advantageous, having the lowest impact on the agricultural land followed by scenario F6. The scenario F1 proved to have the greatest influence on the agricultural land followed by F2 which was in 2007 initially selected as the best option, considering all the evaluation aspects. Subsequently "optimized" scenario F2-2 also showed considerate impact on the agricultural land, although the optimization was initially aimed to reduce the impacts on the agricultural land. The result of our evaluation showed that SMARTER method is suitable and effective method for spatial impacts evaluation of interventions on agricultural land. This study that for proposes the introduction and complementation of the existing methodology for spatial impact evaluation in terms of agricultural land protection as part of systematic spatial planning and management solutions in Slovenia and to pursue exploration and development of new evaluation methods for other aspects.