U.S. Route 66 | U.S. Route 1 | U.S. Route 6 | U.S. Route 101 | Route 66 | U.S. Route 30 | New Jersey Route 4 | European route E65 | U.S. Route 40 | California State Route 1 | U.S. Route 1 in Maine | Pennsylvania Route 309 | European route E18 | U.S. Route 23 | European route E4 | U.S. Route 9 in New York | U.S. Route 11 | Pennsylvania Route 82 | European route E70 | U.S. Route 90 | U.S. Route 75 | U.S. Route 61 | U.S. Route 60 | Pennsylvania Route 73 | New York State Route 32 | European route E55 | U.S. Route 80 | U.S. Route 71 | U.S. Route 51 | U.S. Route 22 |
Route 198 was commissioned in 1932, running along the current route of Route 171 from former Route 15 (now I-84) in Union to former Route 91 (now Route 171) in Woodstock.
SR 504 was once planned to be a short freeway to connect with the Berlin Turnpike (U.S. Route 5 and Route 15) near the South Meadows Expressway connector.
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In 1963, however, the state proposed the corridor as the Cedar Ridge Connector with no number, leading from its current terminus at I-84 to U.S. 5/Route 15 in Wethersfield.
Exit numbering on I-86 was that of the road's predecessor, Route 15, in a sequence beginning on New York's Hutchinson River Parkway.
After crossing under I-84, Route 131 meets the former northern end of Route 15, which was a continuation of Connecticut Route 15.
Route 15 begins in the town of Stonington, at the intersection of Main Street, School Street, and West Main Street.
Route 15 intersects US 1A (Newport Avenue) and becomes an undivided highway as it passes Slater Park and crosses the Ten Mile River.
After entering Francisville, Route 15 loops partially around the south side of Girard College, but rejoins Girard Avenue again, and passes by St. Joseph's Hospital.
The major route from USJ and Subang Jaya to Kuala Lumpur and Petaling Jaya is the Subang-Kelana Jaya Link, which also connects the Persiaran Kewajipan roundabout of the New Pantai Expressway10) towards the Subang Airport expressway (route 15) of Federal Highway2).