Adherence to the use of child restraint system (CRS) can greatly reduce child casualties in road traffic accidents. This study aims to develop the behavior maintenance model of CRS use based on the health action process approach (HAPA) theory to explore the maintenance mechanisms, suggesting appropriate intervention strategies. Adopting the multi-stage stratified cluster random sampling method, a cross-sectional survey for guardians recruited from kindergarten and primary school was conducted using the questionnaire developed based on...