Pediatric physical therapist Scottie Taylor summarized this simple but useful study of how children with Down syndrome interact with ride-on cars.
Christina M. Hospodar, Andrina Sabet, Samuel W. Logan, Michele A. Catena & James C. Galloway (2021). Exploratory analysis of a developmentally progressive modified ride on car intervention for young children with Down syndrome. Disability and Rehabilitation: Assistive Technology, 16:7, 749-757. DOI: 10.1080/17483107.2019.1710773.