I-73/74 North-South Corridor
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The I-73/74 North-South Corridor is a High Priority Corridor on the National Highway System in the United States. It is defined by federal law to run from Charleston, South Carolina to Detroit, Michigan and Sault Ste. Marie, Michigan.[1]
The corridor passes thrugh the states of South Carolina, North Carolina, Virginia, West Virginia, Ohio, and Michigan. Ohio and Michigan do not plan to build any parts of the corridor, and West Virginia is building their section (mostly along U.S. Route 52) as a four-lane divided highway, not meeting Interstate standards. On the other hand, South Carolina and North Carolina have built sections, and Virginia plans to build its part. Thus Interstate 73 will, once scheduled projects are completed, run from South Carolina to Roanoke, Virginia, and Interstate 74 will run from South Carolina to somewhere along its overlap with Interstate 77. This I-74 will not connect to the Interstate 74 that ends in Cincinnati, Ohio unless West Virginia and Ohio decide to build and upgrade their sections.
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[edit] General routing
[edit] South Carolina and North Carolina
I-73 and I-74 both begin at Georgetown, South Carolina and run to Myrtle Beach. I-73 splits to the northwest to Rockingham, North Carolina and then heads north along U.S. Route 220 via Greensboro to Virginia. I-74 continues northeasterly from Myrtle Beach along U.S. Route 17 into North Carolina. There it arcs northwest and follows U.S. Route 74 to Rockingham. I-73 and I-74 overlap to Asheboro, where I-74 splits northwest along U.S. Route 311 through High Point to Winston-Salem and U.S. Route 52 to Interstate 77 near the Virginia state line.[1]
[edit] Virginia
In Virginia, I-73 is defined to use U.S. Route 220 and U.S. Route 460. I-74 is completely overlapped with Interstate 77 in Virginia.[1]
[edit] West Virginia
In West Virginia, I-73 follows U.S. Route 460 west from the Virginia state line to Bluefield. There it joins I-74, which splits from Interstate 77 just across the border from Virginia. The two routes combine for the rest of the corridor along U.S. Route 52 to Huntington and Ohio.[1]
[edit] Ohio
In Ohio, the corridor follows U.S. Route 52 to Portsmouth. There it splits, with the I-74 section heading northwest along State Route 73 and west on State Route 32 to Cincinnati and the current Interstate 74. I-73 heads north along U.S. Route 23, State Route 15, and Interstate 75 via Columbus and Toledo. At Toledo, the corridor splits, with one branch staying with I-75 and the other using US 23.[1]
[edit] Michigan
One branch of the corridor continues northeast on Interstate 75 to end in Detroit. The other branch splits northwest from U.S. Route 23 along U.S. Route 223, then taking U.S. Route 127 north via Jackson and Lansing. The corridor merges with I-75 at the north end of US 127 and uses I-75 to the International Bridge in Sault Ste. Marie.[1]
