Quote Quoting RosemontReporter
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I belive the Pennsylvania law is a little bit vague regarding whether or not it is illegal as the stop signs are on private school property.
If this is a public school, then the land is likely public land owned by a Board of Education or a municipality. The stop sign is also likely in the road easement right-of-way as are all traffic control signs. And, even if the land was private, a site plan approval by a local jurisdiction or an agreement resolution or ordinance to enforce traffic control by a local jurisdiction all would make the sign enforceable.