| Highway 21 | |
|---|---|
| Route information | |
| Maintained by Puerto Rico DTPW | |
| Highway system | |
Puerto Rico Highway 21 is the main highway that takes to the Medical Center and Veterans Hospital in San Juan, Puerto Rico. It begins in PR-19 in Guaynabo to San Juan before ending in PR-1.
PR-6 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.