Delaware constitution
Article II
Section 19

No road, highway or street, intended to be dedicated to public use and maintained at public expense, shall be constructed except in conformance with standards adopted by the agency charged with construction, reconstruction or maintenance of such road, highway or street. Any road or street constructed solely for private use shall only be maintained at State expense after it has been constructed or reconstructed according to the standards established by the agency charged with the duty of maintaining such roads or streets.