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Diverging Diamond Interchange: I-66 and Route 15

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Diverging Diamond Interchange presentation from community meetings on Dec. 7 and 13, 2016

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Diverging Diamond Interchange: I-66 and Route 15

  1. 1. Opening of the Diverging 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. 2. Tonight’s Meeting • Project Status • 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. 3 Project Status (Items in Orange 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. 4. Opening the DDI Configuration • 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. 5. Detour – Night of Jan. 6 (or Jan. 13) 5
  6. 6. 6 Diverging Diamond Interchange Traffic Flow
  7. 7. 7 Diverging Diamond Interchange Traffic Flow
  8. 8. 8 Project Schedule Contract awarded May 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. 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. 10. Stations Around the Room • 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. 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. 13. Traffic Comparison to VDOT’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. 14. 80 530 140 0 140 150 480 550 120 440 150 190 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. 15. How Haymarket DDI differs from Zion Crossroads DDI 15 Triple Left Dual Left 3 Lanes NB/SB Single Right Spur Ramp to H

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