Under Construction: Interstate 95 / Route 630 (Courthouse Road) Interchange Relocation and Route 630 Widening

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The project is rebuilding the Interstate 95 interchange at Exit 140 (Route 630/Courthouse Road) in Stafford County as a diverging diamond interchange, slightly south of the existing interchange. The new overpasses will carry Courthouse Road traffic over the interstate.

The project will also relocate the intersection of Courthouse Road and Route 1 to the south to align with Hospital Center Boulevard.

Courthouse Road will be widened to four lanes between Route 1 and I-95. West of I-95, Courthouse Road will be widened to four lanes to just west of Ramoth Church Road and Winding Creek Road. 

Project Design: Courthouse Road Widening

Project Design: Exit 140 Interchange

Project Design: Exit 140 interchange (side view)

Benefits 

The new interchange will address existing capacity issues, eliminate substandard vertical clearance for the existing I-95 bridges over Courthouse Road, and accommodate future expansion of both the I-95 and Courthouse Road corridors.

The diverging diamond interchange will decrease congestion, since traffic turning left onto the interstate on-ramp does not have to stop at a signal. The innovative intersection significantly lowers the number of conflict points, where crashes are more likely to occur.

The sleeker design of the diverging diamond interchange requires less property to build, which lowers project cost and minimizes impacts to nearby homes and businesses.

The project widens Courthouse Road to allow more vehicle capacity. In addition, the project is realigning Ramoth Church Road to Winding Creek Road.  A new traffic signal has been added to Colonial Forge High School and Liberty Knolls entrance. A traffic signal will be installed at Ramoth Church and Winding Creek roads in Spring 2019.

Major Milestones 

July 10, 2017: Construction begins on the Courthouse Road widening project west of I-95.

Fall 2017: Construction begins on Exit 140 interchange and Courthouse Road widening east of I-95.

December 20, 2019: Completion of Courthouse Road widening west of I-95.

July 31, 2020: Construction complete on entire project, with the diverging diamond interchange open to traffic.

Resources

Other relevant links:

Diverging Diamond Interchange (DDI)

A diverging diamond interchange (DDI) is an innovative design that is increasingly being used by state transportation departments.

The ramp configuration is similar to a traditional diamond interchange.

However, traffic on the cross street, Courthouse Road, will switch sides.

Traffic is shifted to the left side of the road, which allows vehicles turning left to enter an interstate on-ramp without stopping at a traffic signal.

Frequently asked questions

YouTube simulation of diverging diamond interchange at Interstate 64 and Route 15, Zion Crossroads, Louisa County, Virginia

A traffic analysis, in the form of an Interchange Modification Report, has been performed on the diverging diamond interchange concept.

The findings, approved by the Federal Highway Administration, are below.

Supplement to the Interchange Modification Report

Phase: Under Construction

UPC: 13558, 4632

State ID: 0095-089-F09, 0630-089-202

Federal ID: C00013558DB83

Long/Lat: 38.422108, -77.423058

Locality: Stafford

Page last modified: May 31, 2019