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The current US 1-A route (4th one created) was born in 1953 as a renumbering of mainline US 1 in Wake Forest/Youngsville which was moved to a western new routing.
This US 1-A route was once part of original NC 50.
It is a mystery why this wasn't converted to US 1 Business in 1960.
US 1 north of Raleigh, showing only US 1-A #3
1951 Official
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US 1-A #4 Wake Forest and US 1-A #5 Franklinton
1953 Official
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There have been several other US 1-A's:
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The first US 1-A may have appeared In 1933, as a second route between Cary and Raleigh. This US 1-A followed US 70's routing between the cities, along Western Blvd (see the scan for other Raleigh Sts. used). This US 1-A shows up on General Drafting Maps from at least 1933-35 (check out the far left of the scan below on the Western Outlet road). The 1936 Gen Drafting calls it US 70 only.
The second US 1-A appeared in 1946, running from Wake Forest Rd along Louisburg Rd (with NC 59), then cutting north as new routing to meet back up with Wake Forest Rd.
This US 1-A and US 1 Wake Forest Rd switched designations in 1948, creating the third US 1-A. This US 1-A was decommissioned in 1956 or 1957 to secondary routing.
US 1-A #2 on Louisburg Rd
1947 Gen Draft
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US 1 and US 1-A swap
1948 Amoco
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US 1-A #1 in 1933?
1933 Gen Draft
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The 5th US 1-A appeared in 1953 when US 1 was rerouted around the west of Franklinton. See mapscan under the active US 1-A above. It is a mystery why this wasn't converted to US 1 Business in 1960. In June 2024 (NCDOT), this US 1-A was downgraded to SR 2130 below NC 56 and SR 1297 above NC 56. The Franklinton US 1-A stopped showing up on NC Officials in 2001 or 2002 but was still posted until its 2024 decommissioning.
The 6th US 1-A appeared in 1957 when Southern Pines was bypassed to the west. May St through town became US 1-A. It is unclear if US 1-A became US 1 Business here in 1960. The route is shown as secondary on the 1962 Moore County map.
US 1 through Southern Pines
1953 Moore County
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US 1-A #6 through Southern Pines
1957 Moore County
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May St is SR 2080 in 1962
1962 Moore County
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The 7th US 1-A appeared in 1957 when Sanford was bypassed to the west. Carthage Rd through town became US 1-A. In 1960 this was renumbered as US 1 Business which it remains today except below NC 42 is now secondary. US 1-A was cosigned with US 15A-501A.
US 1 through Sanford
1953 Lee County
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US 1-A #7 through Sanford
1957 Lee County
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US 1 becomes US 1 Bus
1962 Lee County
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In 1957, the 8th US 1-A was created when US 1 was given a super-2 bypass to the east of Henderson. The original route through Henderson became US 1-A which was renumbered as US 1 BUsiness in 1960.
US 1 through Henderson
1953 Vance County
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US 1-A #8 through Henderson
1957 Vance County
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US 1 Business replaces US 1-A
1962 Vance County
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