PR-129 is a north–south (actually diagonal) highway in North-Central Puerto Rico

Puerto Rico

Puerto Rico , officially the Commonwealth of Puerto Rico , is an unincorporated territory of the United States, located in the northeastern Caribbean, east of the Dominican Republic and west of both the United States Virgin Islands and the British Virgin Islands.Puerto Rico comprises an...

, connecting the town of Lares

Lares, Puerto Rico

Lares is a small mountain municipality of Puerto Rico's central-western area located north of Maricao and Yauco; south of Camuy, east of San Sebastián and Las Marias; and west of Hatillo, Utuado and Adjuntas. Lares is spread over 10 wards and Lares Pueblo...

 with Arecibo

Arecibo

Arecibo may refer to:*Arecibo, Puerto Rico, a municipality located by the Atlantic Ocean*Arecibo Observatory, a very sensitive radio telescope located approximately south-southwest from the city of Arecibo...

. It crosses the northern karst

KARST

Kilometer-square Area Radio Synthesis Telescope is a Chinese telescope project to which FAST is a forerunner. KARST is a set of large spherical reflectors on karst landforms, which are bowlshaped limestone sinkholes named after the Kras region in Slovenia and Northern Italy. It will consist of...

 country of the island. When taveling from the northern coast of Puerto Rico, PR-129 can be used to reach the Arecibo Observatory

Arecibo Observatory

The Arecibo Observatory is a radio telescope near the city of Arecibo in Puerto Rico. It is operated by SRI International under cooperative agreement with the National Science Foundation...

 and the Camuy River Caverns Park.

Route description

It is a 4 lane divided highway in Arecibo, and a Super Two

Super two

A super two, super two-lane highway or wide two lane is a two-lane surface road built to high standards, typically including partial control of access, occasional passing lanes and hard shoulders...

in Hatillo

Hatillo

Hatillo or El Hatillo can refer to:* Hatillo, Puerto Rico* Hatillo de Loba, a town and municipality in Bolívar, Colombia* El Hatillo Municipality, Miranda, Venezuela** El Hatillo Town, Miranda, the seat of El Hatillo Municipality...

, Camuy and Lares. It then merges with PR-111, being entirely unsigned throughout this section. It then heads south as a narrow, rural road, and ends at PR-135 near Adjuntas. Its speed limit is overall 45 mi/h through its highway section. It was originally a narrow, two lane road. Much of the original alignment is now PR-134.