Abstract
The discharge of road runoff water and the requirements for water protection (e.g. Water Framework Directive) places a pressure on the need for sound methodologies for environmental sustainability. A bilateral cooperation research permitted a comparison between Portuguese and Slovenian prac tices related to water protection from road runoff. In recent years both countries were confronted with a rapidly developing national highway network. Based on this study, a new methodology for sound water pro tection from road pollution was developed and applied to case studies in both countries, being hereinafter presented. The method showed a good potential for application, and the authors believe it to be a step forward to sustainable water protection.