Most streets in older parts of the country were not designed for people to drive on, and plenty of children played on them. Motor vehicles simply killed enough

Most streets in older parts of the country were not designed for people to drive on, and plenty of children played on them. Motor vehicles simply killed enough children when they first became common that children were forced elsewhere. https://mitpress.mit.edu/books/fighting-traffic https://mitpress.mit.edu/books/fighting-traffic