# Puerto Rico Highway 181

Puerto Rico Highway 181 (PR-181), also known as Expreso Trujillo Alto (Trujillo Alto Expressway), is a road in Puerto Rico connecting the municipality of San Juan on the northeastern coastal plain with Patillas on the southeastern coastal plain. Beginning in the Rio Piedras district of barrio Oriente in San Juan at Jesus de Piñero Avenue (PR-17), it runs through Trujillo Alto, Gurabo and San Lorenzo on the Caguas Valley, and western Yabucoa and eastern Patillas on the Sierra de Cayey, before ending in the Patillas Pueblo downtown area on the southeastern coastal plain of Puerto Rico. PR-181 is a four-lane highway from San Juan through the Trujillo Alto Pueblo downtown area, and completely rural on the way to Patillas with the exception of a small tract in Gurabo where it intersects PR-30. Along with PR-10, PR-149, PR-1 and PR-52, it is one of the longest roads crossing the main island from north to south.

## Route description
### Rural road

* Puente de Trujillo Alto
* Trujillo Alto marker on PR-181
* PR-181 north in Gurabo
In Trujillo Alto, near Gurabo, it turns into a rural road with very narrow lanes per direction and hard curves, making it dangerous and requiring low speed limits. In Gurabo, it becomes divided in about 1 kilometer as it intersects Puerto Rico Highway 30, and then quickly turns rural. In San Lorenzo its makes intersection with Puerto Rico Highway 183. For the rest of its length it is still rural. In Yabucoa, PR-182 begins to connect to the main town, while PR-181 continues and as it enters Patillas, it borders lake Carite, before arriving to downtown Patillas, where it meets PR-3.

## Major intersections

* PR-30 east at exit 7 to PR-181 in Gurabo
| Municipality | Location | km | mi | Destinations | Notes |
| Patillas | Patillas barrio-pueblo | 0.0 | 0.0 | PR-3 (Calle Luis Muñoz Rivera) – Arroyo, Maunabo | Southern terminus of PR-181 |
| Patillas | Patillas barrio-pueblo | 0.3 | 0.19 | PR-799 – Cacao Alto | |
| Patillas | Marín | 3.6 | 2.2 | PR-7759 – Marín | |
| Patillas–Maunabo municipal line | Marín–Matuyas Alto line | 10.3 | 6.4 | PR-759 – Maunabo | |
| Yabucoa | Guayabota | 15.1 | 9.4 | PR-182 (Ruta Panorámica) – Yabucoa | Southern terminus of the Ruta Panorámica concurrency |
| San Lorenzo | Espino | 20.6 | 12.8 | PR-7740 (Ruta Panorámica) – Cayey | Northern terminus of the Ruta Panorámica concurrency; the Ruta Panorámica continues toward Patillas |
| San Lorenzo | Espino | 21.7 | 13.5 | PR-9920 – Quebrada Arenas | |
| San Lorenzo | Espino | 22.0 | 13.7 | PR-745 – Espino | |
| San Lorenzo | Quebrada Honda | 23.0 | 14.3 | PR-902 – Quebrada Arenas | |
| San Lorenzo | Quebrada Honda | 24.1 | 15.0 | PR-913 – Quebrada Honda | |
| San Lorenzo | Quebrada Honda | 24.9 | 15.5 | PR-9912 – Cayaguas | |
| San Lorenzo | Jagual | 28.1 | 17.5 | PR-765 – Jagual | |
| San Lorenzo | Hato–Quemados line | 32.0 | 19.9 | PR-788 – Quemados | |
| San Lorenzo | Hato–Quemados line | 32.710.3 | 20.36.4 | PR-183 west (Carretera Jesús Santa Aponte) – Caguas, Gurabo | Western terminus of PR-183 concurrency |
| San Lorenzo | Hato–Quemados line | 10.632.8 | 6.620.4 | PR-183 east (Carretera Jesús Santa Aponte) – Las Piedras | Eastern terminus of PR-183 concurrency |
| San Lorenzo | San Lorenzo barrio-pueblo | 33.8 | 21.0 | PR-980 (Calle Varona Suárez) – Las Piedras | One-way street; eastbound access via Calle José de Diego |
| San Lorenzo | San Lorenzo barrio-pueblo–Hato line | 34.7 | 21.6 | PR-9931 – Caguas | |
| San Lorenzo | Quebrada | 37.9– 38.0 | 23.5– 23.6 | PR-931 – Navarro | |
| San Lorenzo | Quebrada | 38.5 | 23.9 | PR-929 – Juncos | |
| Gurabo | Jaguar | 40.8 | 25.4 | PR-9933 – Juncos | |
| Gurabo | Jaguar–Mamey line | 42.8 | 26.6 | PR-30 (Expreso Cruz Ortiz Stella) – Caguas, San Juan, Juncos, Humacao | PR-30 exits 7 and 8; diamond interchange |
| Gurabo | Mamey | 43.5 | 27.0 | PR-189 – Gurabo, Juncos | |
| Gurabo | Celada | 45.4 | 28.2 | PR-944 – Hato Nuevo | |
| Gurabo | Celada | 45.5 | 28.3 | PR-943 – Gurabo | |
| Gurabo | Quebrada Infierno–Masa line | 50.6 | 31.4 | PR-945 – Masa | |
| Gurabo | Quebrada Infierno–Masa line | 54.1 | 33.6 | PR-851 (Carretera Reverendo Erasmo Ocasio Adorno) – La Gloria | |
| Trujillo Alto | Quebrada Negrito–Dos Bocas line | 58.4 | 36.3 | PR-852 – Quebrada Grande | |
| Trujillo Alto | Dos Bocas–La Gloria line | 59.5 | 37.0 | PR-851 (Carretera Reverendo Erasmo Ocasio Adorno) – La Gloria | |
| Trujillo Alto | Trujillo Alto barrio-pueblo–La Gloria line | 61.4 | 38.2 | PR-894 to PR-175 – Caguas | |
| Trujillo Alto | Río Grande de Loíza | 61.7– 61.9 | 38.3– 38.5 | Puente de Trujillo Alto | Puente de Trujillo Alto |
| Trujillo Alto | Cuevas–St. Just line | 61.9 | 38.5 | PR-175 / PR-8860 east to PR-876 (Carretera Federico Degetau) – Caguas, Carolina | |
| Trujillo Alto | Cuevas–St. Just line | 63.4 | 39.4 | PR-850 to PR-876 (Carretera Federico Degetau) – Cuevas | Southbound exit and entrance |
| Trujillo Alto | Cuevas–St. Just line | 63.5– 63.6 | 39.5– 39.5 | PR-199 west (Carretera Coronel Pedro L. Negrón Ramírez) / PR-876 (Carretera Federico Degetau) – Cupey, Guaynabo | |
| Trujillo Alto | Cuevas–St. Just line | 63.8 | 39.6 | PR-848 (Avenida Juan José "Chejuán" García Ríos) – St. Just | |
| Trujillo Alto–San Juan municipal line | St. Just–Cuevas– Sabana Llana Sur tripoint | 65.3 | 40.6 | PR-846 / PR-876 (Carretera Federico Degetau) – Cuevas, St. Just | |
| San Juan | Sabana Llana Sur | 65.6 | 40.8 | PR-877 (Avenida Trujillo Alto) – Sabana Llana Sur | |
| San Juan | Sabana Llana Sur–Oriente line | 67.1– 67.4 | 41.7– 41.9 | PR-3 (Avenida 65 de Infantería) / PR-47 (Calle De Diego) – Río Piedras, Caguas, Carolina | Diamond interchange |
| San Juan | Oriente | 68.65 | 42.66 | PR-17 (Expreso Jesús T. Piñero) – San Juan, Hato Rey, Carolina, Isla Verde | Northern terminus of PR-181; PR-17 exits 7B and 8 |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus Incomplete access ||||||
* 1 2 Kilometer markers represent the distance along PR-183 rather than PR-181.