Answer the following question: Information:  - Puerto Rico Highway 167 is one of the main highways in the San JuanCaguasGuaynabo metropolitan area of Puerto Rico. This Highway starts at Puerto Rico Highway 165 in Levittown and goes until Puerto Rico Highway 156 in Comerío. It is two-lane per direction all through Cataño and a vast area of Bayamón, and becomes rural a couple of kilometers before entering through Naranjito. During the rainy season this road is risky as there is chance of rock fall and debris onto the road. This happens mainly due to increase in moisture content in the soil, which loosens the suspending rocks adjacent to the highway. It is proposed to make this road fully parallel to the future tollway PR-5, which will be extended until Comerío. The future tollway will pass through the only cable-suspended bridge in the island in Bayamón near the border with Naranjito. The Plata Bridge, a Parker truss bridge built in 1908, was the original connection of the route of 167 across the Rio la Plata, spanning between Bayamón and Naranjito municipalities. It has been replaced by an adjacent modern bridge that now carries PR 167.  - The San Juan-Caguas-Guaynabo Metropolitan Statistical Area is a United States Census Bureau defined Metropolitan Statistical Area (MSA) in northeastern Puerto Rico. A July 1, 2009 Census Bureau estimate placed the population at 2,617,089, a 4.31% increase over the 2000 census figure of 2,509,007.  - Plata Bridge, listed in Puerto Rico's bridge inventory as Bridge #374 and now also known as Antiguo Puente Plata, was built in 1908. It is significant as "the only extant large multi span truss bridge in Puerto Rico", according to its nomination document for listing on the National Register of Historic Places. It includes two Parker truss spans and was built in 1908. It brought what is now Puerto Rico Highway 167 across the Rio La Plata, spanning from Bayamon municipality into and Naranjito, and connected several mountain towns to the coastal road along Puerto Rico's north coast.  - Puerto Rico Highway 5 is a main highway in the San Juan Metropolitan area which connects the cities of Cataño to Bayamón and is being extended and converted to a tollway ( it has a toll plaza in Bayamón near PR - 2 and PR - 174 ) to access the municipalities of Naranjito and Comerío . It is a short freeway from south Cataño to the business area in Bayamón . It makes intersections with PR - 22 , PR - 6 , PR - 2 and PR - 199 , where it ends at this time . The highway will parallel Puerto Rico Highway 167 and will contain the new cable - stayed bridge being built between Bayamón and Naranjito . It will probably end in Puerto Rico highway 152 when completed .  - Puerto Rico Highway 156 is a long eastwest highway which connects Caguas to Orocovis and is the main artery to Aguas Buenas since the highway from Puerto Rico Highway 52 to the main downtown has at least two lanes and a shoulder per direction. From Aguas Buenas to Orocovis it is a rural, yet safe road which enters all the business districts and "plazas" of Aguas Buenas, Comerío, Barranquitas and Orocovis. It is the one of two long eastwest highways through the center of the island (the other being Puerto Rico Highway 111) but it does never approach a coast (Puerto Rico Highway 111 approaches Aguadilla's shore near PR-2 but PR-156, ending in Caguas, is near 35 kilometers away from the east coast).    Given the information above, choose from the list below the object entity that exhibits the relation 'instance of' with the subject 'puerto rico highway 5'.  Choices: - area  - artery  - border  - bridge  - couple  - direction  - document  - highway  - island  - metropolitan  - metropolitan area  - metropolitan statistical area  - mountain  - nomination  - road  - rock  - united states census  - will
Answer:
road