| State: | PR |
| Type: | PR |
| Route: | 178 |
| Alternate Name: | Spanish; Castilian: Carretera Monseñor José Antonio Colón Ferrer |
| Maint: | Puerto Rico DTPW |
| Length Km: | 3.2 |
| Established: | 1953[1] |
| Direction A: | CCW |
| Terminus A: | in Guásimas |
| Direction B: | CW |
| Terminus B: | in Arroyo barrio-pueblo–Palmas–Pitahaya |
| Municipalities: | Arroyo |
| Previous Type: | Urban |
| Previous Route: | 177 |
| Next Type: | Ter |
| Next Route: | 179 |
Puerto Rico Highway 178 (PR-178) is the main access to downtown Arroyo, Puerto Rico.[2] This road extends from PR-3 in Guásimas to returning again to PR-3 at its junction with PR-753 between downtown, Pitahaya and Palmas barrios.[3]