74 Pa. Stat. § 35
The jurisdiction of this Commonwealth is hereby ceded to the United States of America over that portion of the public road, known as the Emmitsburg Road, within the limits of the National Park at Gettysburg, as defined by the act of Congress, entitled "An act to establish a National Military Park at Gettysburg, Pennsylvania," approved the eleventh day of February, Anno Domini one thousand eight hundred and ninety-five, extending from the borough line, southwesterly, eight thousand two hundred and sixty-three feet to the public road known as the Wheatfield Road: Provided, nevertheless, That this cession is upon the express condition that the Commonwealth of Pennsylvania so far retains concurrent jurisdiction with the United States, over that part of said road which is hereby ceded, as that all civil and criminal process issued under the authority of this Commonwealth may be executed thereon, in like manner as if this act had not passed.
74 P.S. § 35