Transform I-66 Outside the Beltway (Express Lanes in Northern Virginia) (Design/Build), VA

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Owner: VDOT, FAM

Description: This Public-Private Partnership (P3) project modifies nearly 23 miles of I-66 providing two express lanes alongside three regular lanes from I-495 to Route 29. Endesco provided the following technical services:

Hydraulic design services including hydrologic and hydraulic analysis, scour analysis for bridges and retaining walls, drainage design, stormwater management, and erosion and sediment control plans.
Traffic signal design at 10 intersections.
Used advance video detections, emergency vehicle preemption, special negative overlap phase for pedestrian crossing, flashing beacons, APS/CPS signals, and signal interconnect.
Developed left turn phasing evaluation. Developed calculations for clearance times for Yellow and All-Red per VDOT requirements.
Developed Synchro models for the 10 signals and developed VDOT traffic signal controller timing sheets for various time of day (TOD) schedules.

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