I-395 Express Lanes Extension

This project extended the 395 Express Lanes for eight miles north from Turkeycock Run near Edsall Road to the vicinity of Eads Street in Arlington. The two existing High Occupancy Vehicle (HOV) lanes are being converted to express lanes and a third lane is being added, providing three reversible express lanes. 

NXL was a Sub-Consultant to AECOM and Lane Construction, the Prime for this Design-Build Project for the VDOT Northern Virginia District Office. NXL, using GPS Survey equipment, set up a baseline and control per current project datum and completed the control network needed to collect desired supplementary data utilizing Electronic Survey Instruments and conventional Levels.

NXL located existing Interstate Traffic signs along the project corridor using Electronic Survey Equipment for AECOM so that they could assure that proper clearance was provided for vehicles. Also, NXL used Electronic survey equipment to collect location of physical features that were missing from the existing topographic Aerial Survey used to design the project.

In another phase, NXL relocated the entire clover leaf at Edsall road and I-395 intersection and many obscured areas as defined by AECOM throughout the limits of the project. Additionally, NXL used Electronic Multi-Stations to scan various physical features such as jersey walls, light poles, and columns for bridge crossings that were inaccessible by conventional methods, all while traffic continued to flow at various hours of the day. All work was done using traffic TMA’s and signs provided by LANE Contracting.

Finally, NXL’s Central Virginia and NOVA offices downloaded all of this data collected by data collectors, daily, and processed this information. Once field work was complete, office personnel created the various files needed for design requested by AECOM, such as Survey Design planimetric data, Survey Design utility data, Contour files, Surface 3D points and breaklines and a DTM (Digital Terrain Model) file for design in DGN drawing format, per VDOT standards. All completed under various tight deadlines.


Completion Date



Virginia Department of Transportation




Arlington County, VA

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