Organized by a group of volunteer parents, the Walking School Bus (wsb) was developed in Lausanne as an alternative to children being dropped at school by parent’s car. If its effects have been explored, the factors of involvement favorable to the commitment in this initiative remain scarce. We did an investigation by questionnaire of parents in Lausanne. With 218 participants, we performed a principal component analysis (pca) based on modal habits, perceptions and residential choices. Using the pca, a typology including five clusters was generated, spatially distributed: Activists wsb, Ultra-pedestrians, Indifferent to wsb, Pragmatics and Fervent motorists. The discussion focuses on the social provisions in favour of collective commitments such as wsb.