Three Digit System of Highways in Puerto Rico

Puerto Rico system of highways is random in the one and two-digit configuration; Puerto Rico Highway 65 is in Mayagüez, while Puerto Rico Highway 66 is in Canóvanas and Carolina. Three Digit System is different because it is organized in different areas.

100's

Highways in Puerto Rico in the 1** configuration can be found in all the commonwealth, except for Vieques and Culebra. The lowest numbers will be found in the west (PR-100, PR-101, PR-102 are in Mayagüez, while PR-198 is in Humacao). Some exception violate this order, for example, PR-165 is found in Dorado, Cataño and Guaynabo in the east while PR-166 is in San Germán.

100's road tend to be long. For example; PR-123, PR-149 and PR-181 all transverse from north to south; PR-111 and PR-156 are almost 80 km long going from west to east (but there is not a single road transversing from the west to the east coast). Other long 100-roads that are long are PR-102, PR-119, PR-129 and PR-128.

200's

Highways in this group are mainly found in the municipalities of Vieques and Culebra. Because the island have small populations, only a few highways have this designation; PR-200 and PR-201 in Vieques, and PR-250, PR-251 and PR-252 in Culebra. A noticeable exception is PR-203, the only 200-road in the main island.

300's

Highways in this group are found in the southwest of the island, specifically in the cities of Mayagüez, Cabo Rojo, Hormigueros, San Germán, Sabana Grande, Maricao, Lajas, Guánica, Yauco, Guayanilla and Peñuelas. They tend to be short and rural, but some parts are divided, especially in intersections with PR-2.

400's

Highways in this group are found in the northwest of the island, specifically in Añasco, Aguada, Rincón, Aguadilla, Moca, San Sebastián, Isabela, Quebradillas, Camuy, Hatillo, Lares and Las Marías.

500's

Highways in this group are found in the southwest-central area of Puerto Rico, mainly in Ponce, Juana Díaz, Villalba, Adjuntas, Santa Isabel, Coamo and Jayuya.

600's

Highways in this group are found in the northwest-central and north area of Puerto Rico, mainly in all of the municipalities that PR-22 pass through (From Arecibo to Dorado), and also Florida, Puerto Rico, Utuado, Ciales, and Morovis.

700's

Highways in this group are found in the south and southeast of Puerto Rico, including municipalities such as Caguas, Cidra, Cayey, Salinas, Guayama, Aguas Buenas, Barranquitas, Comerío, Aibonito, Patillas, Arroyo and Maunabo.

800's

Highways in this group are found in the metro and near-metro area of Puerto Rico (except Caguas): Toa Alta, Toa Baja, Bayamón, Cataño, Guaynabo, San Juan, Carolina and Trujillo Alto.

900's

Highways in this group are found in the east side, in all of the municipalities east of Carolina, Caguas, Cayey and Maunabo: Canóvanas, Río Grande, Loíza, Luquillo, Fajardo, Gurabo, Juncos, Las Piedras, Ceiba, Naguabo, Humacao, San Lorenzo and Yabucoa. Some roads in Vieques also have 900-designations, but not Culebra.

4-digit designation

It is usual to see designations such as 33**, 44**, 55**... 99**. Four digit designation is used for very small roads that serve as alternates to three-digit roads. Some of them are divided, but they are considerably short. Their average length is approximately 3 kilometers, and not all of the three-digit roads have them.

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