Preferred Alternative Map
Project Vicinity Map
Project Fast Facts
  • Status: Projects Under Development
  • County: Wake
  • Type of Project: Roadway Upgrade
  • STIP Number: U-5748
  • Estimated Cost: $63.32 million
  • Start Date: 2022
  • Completion Date: TBD
US401 Improvements

Project Overview and Purpose

The N.C. Department of Transportation is planning to upgrade the high-volume intersection of U.S. 401 at Ligon Mill Road and Mitchell Mill Road in Raleigh to reduce congestion and improve traffic in the area.

Approximately 59,800 vehicles pass through the intersection every day, resulting in delays and congestion. By 2040, traffic will increase to approximately 93,200 vehicles per day.

With U.S. 401 being an important link between Fayetteville, Lillington and Raleigh and the population increasing in the area, traffic conditions will only get worse if the intersection is not improved to handle the increased traffic demands.

Project Highlights

The N.C. Department of Transportation is currently studying two design options – referred to as alternatives – for upgrading the intersection of U.S. 401 at Ligon Mill Road and Mitchell Mill Road in Raleigh.

Among 10 options considered, NCDOT chose these designs – referred to as Alternative 5 and Alternative 7 – for further study because they would improve traffic operations at potentially lower project costs. Additionally, the designs would have fewer impacts to nearby properties and on the environment.

Alternative 5

  • Alternative 5 would involve upgrading the intersection to a grade-separated intersection with access provided via a quadrant roadway and ramps. This means Ligon Mill Road and Mitchell Mill Road would cross over U.S. 401 on a bridge.
  • NCDOT would build ramps south of Ligon Mill and Mitchell Mill roads to provide a direct connection from eastbound Ligon Mill Road onto southbound U.S. 401 and from northbound U.S. 401 onto eastbound Mitchell Mill Road.
  • All other turns would be accommodated by a two-way quadrant road, which would connect Ligon Mill Road with U.S. 401. This access road would be northwest of the Ligon Mill and Mitchell Mill crossing of U.S. 401. A traffic signal would be installed at each end of this quadrant road at Ligon Mill Road and U.S. 401.

Alternative 7

  • Alternative 7 would involve building a "continuous-flow" intersection with Mitchell Mill Road and an "offset tee intersection" with Ligon Mill Road.
  • An offset intersection is really two tee intersections – the two side streets intersect with the main road at different points.

    In the case of the Ligon Mill/Mitchell Mill Road intersection with U.S. 401, Ligon Mill Road would be realigned to cross U.S. 401 approximately 1,500 feet north of the current intersection, offsetting the intersection of Ligon Mill Road with U.S. 401 from the Mitchell Mill Road intersection with U.S. 401.

    The existing Ligon Mill Road intersection would be removed, but portions of existing Ligon Mill Road would stay in place to provide access to properties on the west side of U.S. 401.

  • All movements from and to Ligon Mill Road would be accommodated at the new Ligon Mill Road intersection with U.S. 401.
  • The existing Mitchell Mill Road intersection with U.S. 401 would remain in place and would be configured as a "continuous-flow" intersection.
  • A continuous flow intersection is one at which left turns from the main road cross over the opposing travel lanes ahead of the intersection and travel on a separate roadway to the side street. The left turns can then move at the same time as the through traffic on the main road.
    • Traffic wishing to turn left from southbound U.S. 401 onto eastbound Mitchell Mill Road will turn left onto a connector road to be built east of U.S. 401. This connector road would intersect with U.S. 401 between the Mitchell Mill Road and Ligon Mill Road intersections. This connector road would allow left turning traffic from southbound U.S. 401 to turn onto eastbound Mitchell Mill Road at the same time without stopping through traffic on U.S. 401 at the Mitchell Mill Road intersections.
    • Right turns from westbound Mitchell Mill Road onto northbound U.S. 401 would use the connector road to access northbound U.S. 401.
    • Left turns from westbound Mitchell Mill Road onto southbound U.S. 401 and right turns from northbound U.S. 401 onto eastbound Mitchell Mill Road would continue to be made at the existing Mitchell Mill Road intersection with U.S. 401.

Project Cost

This project is listed as Project U-5748 in the N.C. Department of Transportation's State Transportation Improvement Program and is funded for $63.32 million.

Estimated Amount*
Project Development & Design $34,930,000
Property Acquisition $550,000
Construction Costs $27,840,000
Total Cost $63,320,000

Project Timeline

Milestone Dates*
Preliminary designs completed Spring 2018
Public meeting Fall 2018
Preferred Alternative selected Late Fall 2018
Environmental studies completed December 2018
Right of way acquisition begins 2020
Construction begins 2022

*Future dates are preliminary and subject to change

Contact Information

John Conforti
NCDOT Project Manager
(919) 707-6015
Send a message
1548 Mail Service Center
Raleigh, NC 27699-1548

Kory Wilmot, AICP
AECOM
(800) 233-6315
Send a message
701 Corporate Center Drive
Raleigh, NC 27607

Resources for Local Property Owners

Although the N.C. Department of Transportation works to minimize the number of homes and businesses displaced by a road project, it is inevitable, in many cases, that a certain amount of private property is needed. The following information explains right of way acquisition and answers questions about the process.