Puerto Rico Highway 42, or PR-42, is an urban road in Santurce.
Map of PR-42, San Juan, 00908, Puerto Rico
This is a short road that connects from the PR-39 (Calle Cerra) to Lafayette Street and intersects with PR-2. It is parallel to the PR-35 (Avenida Manuel Fernández Juncos) and PR-25 (Avenida Juan Ponce de León). This road is called Calle Las Palmas.
References
Puerto Rico Highway 42 Wikipedia(Text) CC BY-SA