Section 403. By Whom Construction Work to Be Done.--All work of construction, building or rebuilding of highways, excepting that of repairing and maintenance, done under the provisions of this act, may be either (1) by the agents, including cities when so designated by the department, servants and employes of the department, or (2) by contract, and shall be according to plans and specifications to be prepared or approved in every case by the department.
(403 amended Dec. 1, 1965, P.L.1009, No.375)