Del. Code tit. 22, § 711

This chapter shall not be construed to authorize the taking of land nor the authorization of a city or town to lay out or construct any way which may be indicated on any plan or plot until such way has been laid out as a public way in the manner prescribed by law, nor shall this chapter be construed to render a city or town liable for damages except as may be sustained under § 705 of this title by reason of changes in the official map.