Puerto Rico Highway 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. It is, still, a high congested highway, noticeable when congestion jams are found in PR-17 where PR-8 begins and it continues to PR-3. The first kilometers of PR-8 were known before as Puerto Rico Highway 4, but the Department of Transportation numbered all of the highway PR-8 and there is no PR-4 at this time. It ends in PR-3 in Carolina.
Map of PR-8, San Juan, 00924, Puerto Rico
References
Puerto Rico Highway 8 Wikipedia(Text) CC BY-SA