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Frederick County - I-81 Exit 310 at Route 37 (Kernstown Interchange)

Interchange Modification Project
Project Photos
Project at a Glance
Begin Date
CTB Awarded Contract on February 18, 2015

Est Completion Date
Summer 2017

Construction contract value is $24,967,843

Lengths and Limits
1.06-miles long; From: 0.54 miles South of Route 37

General Excavation Inc. (GEI) of Warrenton, Va.


Robert Good, P.E.

Project Details

This project will reconstruct the interchange ramps on Interstate 81, exit 310, at Route 37 (south) in Frederick County. The interchange configuration will feature a “spread diamond” interchange, which will widen and spread the ramps outward from their current intersections with Route 37. This design provides additional turn storage and adds dual left- and right-turn movements to move traffic more efficiently.

The interchange is being designed with future “scalability”, which can accommodate changes in traffic patterns and traffic volumes. The design can accommodate future conversion of the interchange to a partial cloverleaf, a full cloverleaf with collector-distributor lanes, or a multi-level semi-directional interchange. As part of the design contract, the consultant will produce preliminary designs for the final interchange configuration, ensuring that the spread diamond design accommodates and facilitates future phases, as neighboring development and traffic patterns demand more of the interchange.

The final build-out of the interchange will be done in several future phases. In association with the interchange improvements, the Crosspointe developer will continue the extension of Route 37 east of I-81 and build it as part of their construction site. The Federal Highway Administration approved the Interchange Modification Request (IMR), on April 18, 2007. The IMR consists of a three-phase approach to improving the interchange.

Phase one includes the design for the spread diamond configuration, right of way acquisition, utility relocations and construction of the spread diamond interchange. Relocation of Tasker Road and Hillandale Lane to the east is included in the project, to include temporary ramps from Route 37 to Tasker (the ramps will be removed when Route 37 is extended to the east to future Warrior Drive).

Future phase two may include a partial cloverleaf loop and/or widening of the Route 37 bridge over I-81. All phase two work depends on future traffic demand and available transportation funding. Future phase three may be the completion of cloverleaf or flyover ramps. The cloverleaf option may also include collector distributor lanes. Collector distributor lanes run parallel to the interstate roadway, taking traffic of the mainline a mile to half mile prior to the interchange ramps. All phase three work depends on future traffic demand and available transportation funding.

On Interstate 81 in 2015 traffic counts for this location are projected to be 57,270 south of Route 37 and 51,189 north of Route 37. In 2035 traffic counts for this location are projected to be 85,100 southbound, south of Route 37 and 76,064 northbound, north of Route 37.

Location (latitude, longitude): 39°07'13" -78°11'30"

What’s Next

Construction Advertisement – October 2014
Begin construction – April 2015
Project Completion - Summer 2017

Media and Public Events

Location and Design Public Hearing
Thursday, May 24, 2012, 4 p.m. – 7 p.m.
Robert E. Aylor Middle School
901 Aylor Road
Stephens City, Virginia 22655


The project will help alleviate tight turning maneuvers currently being experienced by drivers at this interchange ramps and on Route 37 and U.S. Route 11. The design will allow more lane capacity, including many dual-left turns, to accommodate more vehicles waiting to make a left-turn onto Route 37 and the I-81 ramps.

Traffic Alerts

All of the newly constructed roadways and ramps are open to traffic. Remaining work may require occasional lane or shoulder closures in summer 2017.

Traffic alerts can also be found on the VDOT website under Travel Center, Travel advisories and lane closures. Click on the area of the state you are interested in, and view current travel advisories and lane closures. Click here to go to the Staunton District Travel Center page: Staunton District

Real-time traffic information is available on the VDOT website and also by calling 511 on your landline or wireless phone. Click here to go to 511: Virginia 511 Web.

Project Numbers

State Project: 0081-034-127,P101, R201, C501
Federal Project: NH-081-3(157)
UPC: 75881

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Page last modified: Aug. 29, 2017