I-495 Express Lanes Northern Extension (495 NEXT) | Traffic Engineering, Utility Coordination & Construction Support in Northern Virginia

The I‑495 Express Lanes Northern Extension (495 NEXT) is a major transportation project in Northern Virginia that extends the existing I‑495 Express Lanes by approximately 2.5 miles north, from near Old Dominion Drive to the George Washington Memorial Parkway.

Designed to alleviate congestion and enhance travel reliability,the project involves the addition of two new express (HOT) lanes in each direction, upgrades to interchanges, and substantial improvements to local infrastructure. Specifically, it involves the construction of two new bridges, the replacement of seven existing bridges, and modifications to six more. It also includes the installation of new and replacement noise walls, improved stormwater management, and about four miles of new pedestrian and bicycle paths to enhance community access and safety.

The express lanes will feature dynamic tolling to manage demand and ensure free-flow conditions, with free access forhigh-occupancy vehicles (HOV 3+), buses, and emergency vehicles. These improvements aim to reduce travel times, increase safety, and provide more reliable transportation options for commuters.

By improving connections to major roadways and preparing the corridor for future transit enhancements, 495 NEXT is expected to play a key role in easing traffic across one of the busiest parts of theCapital Beltway. Construction began in 2022, with express lanes projected to open in late 2025 and full project completion by 2026.

PSI also oversaw utility installations, including water, stormwater, electrical, and communication systems, and conducted field inspections in coordination with VDOT and contractors. Their teams monitored erosion and sediment control measures, enforced compliance with traffic management plans, and maintained detailed inspection logs, photographs, and sketches. PSI’s multidisciplinary contributions helped minimize disruption, enhance safety, and support the successful delivery of a high-capacity express corridor designed to meet growing regional travel demands.