Section 309 - Inclusion of common geographical names(a) General rule.--Whenever official advertising or legal advertising involves a road, street, highway, bridge, municipality, village or boundary, the advertisement shall, in order that it may readily be understood by inhabitants of the area involved, include the common, local or general usage designation of every such road, street, highway, bridge, municipality, village or boundary.(b) Mistake.--The inclusion of a common local or general language designation for the purpose of complying with subsection (a), if mistaken or erroneous, shall not invalidate any matter or proceeding which in all other respects is properly and lawfully executed.1976, July 9, P.L. 877, No. 160, § 1, effective in 60 days.