Puerto Rico Highway 8 (PR-8) is a main highway that serves as a third route (the others being PR-3 and PR-26) from San Juan, Puerto Rico to Carolina, Puerto Rico.

The first kilometers of PR-8 (east of PR-17) were known before as Puerto Rico Highway 4, but the Department of Transportation renumbered the entire highway PR-8 and there is no longer a PR-4.

[3] The entire route is located in San Juan.

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