Puerto Rico Highway 108 (PR-108) is a road that travels from Mayagüez, Puerto Rico to Añasco. It begins at its intersection with PR-105 (Calle de la Candelaria) in downtown Mayagüez and ends at its junction with PR-109 in eastern Añasco, near Las MarÃÂas and San Sebastián. Near this road is located the Mayagüez Zoo.
Puerto Rico Highway 3108 (PR-3108) is a bypass road that branches off from PR-108 and ends at PR-2 north of the University of Puerto Rico at Mayagüez. This highway was officially designated as Paseo Juan Mari Brás.