Puerto Rico Highway 24 (PR-24) is a northâÂÂsouth road located between the municipalities of Cataño and Guaynabo, Puerto Rico. This highway extends from Avenida Las Nereidas (PR-888) in downtown Cataño to Avenida El Caño (PR-165) near the Metropolitan Detention Center, Guaynabo. In Cataño, it is known as , and in Guaynabo, as .