This act is not intended and shall not be construed to authorize the Department of Highways to assume for the Commonwealth any obligation to maintain, construct or reconstruct any structure of any kind or character whatsoever situate upon or forming part of any township road described in the foregoing sections of this act, except only drainage structures with a total spanned length not exceeding ten feet measured along the center line of the highway and which were the sole obligation of the townships prior to the passage of this act, or to include or in any manner affect any private road, county road or any road, street or highway in any city, borough or incorporated town of the Commonwealth. Responsibility for the construction, reconstruction and maintenance of any other structures shall remain with the county, township, person, association or corporation responsible therefor at the date of the approval of this act.