[4] Puerto Rico Highway 679 is a rural road with a single lane per direction along its entire length.

[4] The first segment in Dorado is located in southwestern Espinosa barrio, extending from its southern terminus at PR-677 and PR-823 intersection to the Vega Alta municipal limit.

[5] Then, PR-679 return to Dorado with its second segment through western Espinosa and southwestern Maguayo until its northern terminus at PR-2 junction.

[6][7] Prior to its numerical designation, PR-679 was known as Carretera de Quebrada Arenas, a road that ran from PR-2 to Toa Alta through PR-679 and PR-823.

The current numerical designation corresponds to the 1953 Puerto Rico highway renumbering, a process implemented by the Puerto Rico Department of Transportation and Public Works (Spanish: Departamento de Transportación y Obras Públicas) that increased the insular highway network to connect existing routes with different locations around Puerto Rico.