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Diverging Diamond Interchange: I-66 and Route 15
The document summarizes an informational meeting about opening a new Diverging Diamond Interchange (DDI) at Interstate 66 and Route 15 in Prince William County, Virginia. It provides details on the project status and completion timeline, an overview of how traffic will flow through the new DDI configuration, and comparisons of traffic volumes between the new DDI and Virginia DOT's first DDI. The meeting included simulations of traffic flow, informational exhibits, and representatives available to answer questions.
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Diverging Diamond Interchange: I-66 and Route 15
- 1. Opening of theDiverging Diamond Interchange Interstate 66/Route 15 in Prince William County Public Information Meeting Christiana Briganti-Dunn, PE, CCM Design-Build Program Manager Virginia Department of Transportation Jan A. Sherman Design-Build Project Manager The Lane Construction Corporation December 7 and 13, 2016
- 2. Tonight’s Meeting • ProjectStatus • Opening the Diverging Diamond Interchange • Detour for One Night • How to Navigate through the New DDI • Project Schedule and Cost Updates • Stations Around the Room: • Simulation Videos • FHWA Alternative Intersections Video • Interactive Exhibit 2
- 3. 3 Project Status (Items inOrange are Complete, Blue are Ongoing) • Reconstruct I-66/Route 15 interchange as a Diverging Diamond Interchange (DDI) • Replace Route 15 bridges over I-66 • Retaining walls, shared-use path, partial interchange lighting, fencing, and architectural treatments • Geometric and access management improvements to ramps, intersections, Route 55, and frontage road • Provide drainage and stormwater management facilities • Replace/modify traffic signals, signs and sign structures, and guardrail/barrier • Construct a sound barrier Wall • Landscaping (will be completed under separate contract)
- 4. Opening the DDIConfiguration • Close interchange and detour traffic starting 8 p.m. Friday, Jan. 6 (or Jan. 13, weather depending), to place final pavement markings • Route 15 closed from south of Heathcote Blvd to north of Route 55/Washington St • Ramps to and from I-66 will also be closed • Local traffic will be detoured to Old Carolina Rd/ Jefferson St • Interstate traffic use Route 29 in Gainesville • Open DDI to traffic by 9 a.m. Saturday, Jan. 7 (or Jan. 14) • All ramps to and from the Interstate 66 • Two lanes in each direction on Route 15 4
- 5. Detour – Nightof Jan. 6 (or Jan. 13) 5
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- 8. 8 Project Schedule Contract awardedMay 2014 Public information meeting October 2014 Began right-of-way acquisition Winter 2014 Began construction Spring Fall 2015* Open DDI configuration January 2017 Project completion Fall Summer 2017 * Project construction is approximately 70% complete.
- 9. 9 Project Costs Preliminary engineering:$3 Million Right-of-way acquisition and relocation assistance: $8 Million Design/Build contract (final design, utility relocation, and construction), Contingency and VDOT oversight: $48 Million Total cost: $59 Million The above estimate has remain unchanged since October 2014. The project is fully funded by state and federal funds.
- 10. Stations Around theRoom • VISSIM simulation videos • Based on actual design for DDI in Haymarket • Shows future 2036 traffic volumes, AM and PM peaks • FHWA Alternative Intersections Video – “As easy as 1-2-3”: • To Turn Left – Stay to the Left • To Turn Right – Stay to the Right • No Turns at Crossover Intersections – Go “Straight” • Interactive exhibit • Attendees are invited to “walk” through the DDI exhibit the way they would drive through one 10
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- 12. 12 For More Information… http://www.virginiadot.org/projects/northernvirginia/i- 66_and_route_15_interchange.asp OR: •Visit www.virginiadot.org • Click on “Projects and Studies” in the orange bar • Click on the “Northern Virginia” portion of the map • Scroll to “Under Construction” and look for “I-66 and Route 15 Interchange Reconstruction” link Project Manager: Christiana Briganti-Dunn, P.E., CCM Phone: 703-259-2960 E-mail: Christiana.Briganti@vdot.virginia.gov
- 13. Traffic Comparison toVDOT’s 1st DDI 180 270 120 0 120 450 310 300 90 700 180 60 0 160 Zion Crossroads DDI 1500 670 1110 720 I-64 WB Off-Ramp I-64 WB On-Ramp I-64 EB On-Ramp I-64 EB Off-Ramp US Route 15 I-64 2010 AM Peak 40 1160 320 0 200 40 600 580 780 510 810 130 0 100 Haymarket DDI 570 1520 1010 2880 I-66 WB Off-Ramp I-66 WB On-Ramp I-66 EB On-Ramp I-66 EB Off-Ramp US Route 15 I-66 2011 AM Peak
- 14. 80 530 140 0 140 150 480 550120 440 150 190 0 350 Zion Crossroads DDI 1070 1720 1120 1450 I-64 WB Off-Ramp I-64 WB On-Ramp I-64 EB On-Ramp I-64 EB Off-Ramp US Route 15 I-64 2010 PM Peak 110 1010 740 0 880 140 580 1510 380 680 310 40 0 50 Haymarket DDI 1130 740 2500 1340 I-66 WB Off-Ramp I-66 WB On-Ramp I-66 EB On-Ramp I-66 EB Off-Ramp US Route 15 I-66 2011 PM Peak Traffic Comparison to VDOT’s 1st DDI
- 15. How Haymarket DDIdiffers from Zion Crossroads DDI 15 Triple Left Dual Left 3 Lanes NB/SB Single Right Spur Ramp to H