Project 2 north central expy-high 5 interchange 092210

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Case Study #2 for UTCM Report #08-14-03 "Making Mobility Improvements a Community Asset: Transportation Improvements Using Context-Sensitive Solutions"

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Project 2 north central expy-high 5 interchange 092210

  1. 1. Project 2North Central Freeway (US 75) and High Five Interchange Reconstruction Dallas, Texas 1
  2. 2. North Central Expressway Constructed 1947 (4-6 lanes) Capacity exceeded after about 10 years Initial planning for more capacity  Started in early 1970s  More lanes in existing ROW  Double deck (similar to Austin I-35)  Broadly opposed (twice)  Noise  Aesthetics  Maintenance of traffic concerns  ROW acquisition By 1980, congestion 12 hours/day NCE near Walnut Hill looking south toward downtown in 1959. Source: http://www.texasfreeway.com/dallas/historic/photos/images/us75_central_walnut_hill_looking_south_2_1959.jpg 2
  3. 3. North Central Expressway  Same segment 29 years later (before improvement)NCE near Walnut Hill looking south toward downtown in 1988. Source:http://www.texasfreeway.com/dallas/historic/photos/images/tti_us75_walnut_hill_may_88.jpg 3
  4. 4. Collaborative Approach – Early 1980s North Central Task Force  City of Dallas  TxDOT  Chamber of Commerce  DART  Property owners  Business leaders  Elected officials North Central Task Force Organization. Source: North Central Task Force reports Initiated North Central Project (~10 miles)  10 miles  Collaborative  Consensus plan  Meet corridor objectives, concerns  Led by C of C Transportation Committee chair  Nationally respected project manager  Multidisciplinary deign team 4
  5. 5. Ultimate Proposal 8+ lanes At-grade and depressed sections Extensive retaining wall to reduce ROW needs Cantilevered frontage roads (some) LRT in tunnel under frontage road Aesthetics package (renowned architect) Typical cross-sections: north, central, south sections 5
  6. 6. Features – Before and AfterSection of NCE at Northwest Highway interchange showingexisting and improved configurations (visualization).Source: Regional Mobility Initiatives, NCTCOG, Vol. 11, No.1, July 1997. 6
  7. 7. FeaturesSource: http://www.texasfreeway.com/Dallas/photos/us75/us75.shtml 7
  8. 8. Features Source: TTI 8
  9. 9. FeaturesDART LRT line at north end of tunnel under NCE. Source: Regional MobilityInitiatives, NCTCOG, Vol. 11, No. 1, July 1997. 9
  10. 10. “High Five” Interchange Project  Last part of NCE project  Followed NCE north and south of I-635  Delayed due to cost and funding  Full replacement Before reconstruction. Looking south on US 75 at I-635. Source: TTI 10
  11. 11. Project Components Fully directional high speed ramps NCE widened to 8 basic lanes Accommodate wider I-635 Include HOV ramps Maintain existing number of lanes during construction Issues Construction duration Impact of construction on businesses 11
  12. 12. CSS Solution  Collaboratively discuss needs and possible solutions  Extensive public outreach  Reduce construction duration  Innovative construction techniques  Contractor flexibility to innovate  Incentives/disincentives  Night construction  Off-site pre-casting  Maintenance of traffic  Existing number of lanes during day  Coordinate other improvements with High Five schedulePhoto: Segment erector technology. Source: http://www.urbantransport-technology.com/projects/dallas_1/dallas_19.html 12
  13. 13. Expediting ConstructionErecting bridges by pre-cast sections. Source:http://www.houstonfreeways.com/modern/dfw_high_five_2003-10-27.aspx 13
  14. 14. Expediting ConstructionExpedited construction while maintaining original number of lanes. Source: Eric Slotboom 14
  15. 15. Result Before reconstruction. Looking south on US 75 at I-635. Source: TTISource: Google Earth 15
  16. 16. NCE near downtown in 1958. Source:http://www.texasfreeway.com/dallas/historic/photos/images/us75_central_n_of_downtown_july_1958.jpg 16

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