18 Pa.C.S. § 2707: Propulsion of missiles into an occupied vehicle or onto a roadway.

(a) Occupied vehicles.--Whoever intentionally throws, shoots or propels a rock, stone, brick, or piece of iron, steel or other like metal, or any deadly or dangerous missile, or fire bomb, into a vehicle or instrumentality of public transportation that is occupied by one or more persons commits a misdemeanor of the first degree.

(b) Roadways.--Whoever intentionally throws, shoots, drops or causes to be propelled any solid object, from an overpass or any other location adjacent to or on a roadway, onto or toward said roadway shall be guilty of a misdemeanor of the second degree.