8 Pa.C.S. § 1905: Overhead and underground passageways.

If the comfort and safety of the residents of a borough and an adjoining municipality are enhanced by any overhead or underground passageway connecting with adjoining streets in either the borough or the municipality and extending to any plant or place of business where residents of the borough are employed, the borough may, jointly with each adjoining municipality, construct and maintain any passageway or may join with other interests in the construction and maintenance of the passageway.