Kohlmoos' frustration prompted her to start a petition to Jeff Knueppel, SEPTA's general manager, to allow parents to keep their children in strollers on buses, at least when the bus isn't crowded. The petition had garnered more than 7,000 signatures in about a week as of Friday. Sixty of those were from people in the Philadelphia area, but the issue clearly resonates beyond this city. Signatures came from as far afield as India, South Africa, and the United Kingdom.