Puerto Rico Highway 31Puerto Rico Highway 31 is a main, rural highway connecting Juncos with Naguabo in eastern Puerto Rico. This road begins at Puerto Rico Highway 198 and ends at Puerto Rico Highway 3.Route descriptionPR-31 is an alternate route for people who are going from Caguas and other nearby towns to Naguabo, without having to pass through Humacao. It is located south of El Yunque and is constantly flooded, even with little rainfall. Several farms are close to this highway and it has two intersections with Puerto Rico Highway 53. Taking PR-30 and PR-53 to Naguabo can be faster depending on the traffic.