Puerto Rico Highway 21
Encyclopedia
Puerto Rico Highway 21 is the main highway that takes to the Medical Center and Veterans Hospital in San Juan, Puerto Rico
San Juan, Puerto Rico
San Juan , officially Municipio de la Ciudad Capital San Juan Bautista , is the capital and most populous municipality in Puerto Rico, an unincorporated territory of the United States. As of the 2010 census, it had a population of 395,326 making it the 46th-largest city under the jurisdiction of...

. It begins in PR-19 in Guaynabo to San Juan before ending in PR-1
Puerto Rico Highway 1
Puerto Rico Highway 1 connects the city of Ponce to San Juan. Leaving Ponce, the road follows somewhat parallel along the southern coast of the island and, at Salinas, it turns north to cut through the Cordillera Central in its approach to San Juan....

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Puerto Rico Highway 6

PR-6
Puerto Rico Highway 6
Puerto Rico Highway 6 is a freeway about 3 kilometers long that serves as a by-pass route from Puerto Rico Highway 5 to Puerto Rico Highway 2. The road is located entirely in the municipality of Bayamón. It crosses a sector called "Villa España"....

was previously numbered as PR-21. Perhaps there were plans to connect current PR-21 to current PR-6, but such plans were never realized.
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