UNION CENTRE BLVD AND I-75 INTERCHANGE WEST CHESTER, OHIO

Transcription

1 UNION CENTRE BLVD AND I-75 INTERCHANGE WEST CHESTER, OHIO

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4 New interchange Completed in 1997 Project coordinated by the Butler County TID Cooperation of local public and private sector entities

5 Union Centre interchange and its resulting transportation projects have brought about sustained and well-planned economic growth resulting in job creation and improved quality of life. Since 1997 in southeast Butler County: $1,542,349,540 of new real and personal property investment. 16,854,382 square feet of new corporate office, manufacturing, distribution, research and design, and commercial projects. 17,455 new jobs. Record business, manufacturing, and distribution growth. Major new office / technology development. Major new health care projects. Emerging regional center for health care, education.

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8 I-75 and UCB In 2006, DDI considered ODOT deemed too risky Muhlhauser Rd a big concern

9 I-75 and US 224 Findlay, Ohio DDI was leading alternative in 2006 Rejected at final decision due to safety concerns for unproven design

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12 Double Crossover Diamond (DCD) Interchange An alternative interchange to conventional diamond interchange Gilbert Chlewicki reinvented DDI concept

13 Grad University of Maryland France was using DDIs since 1970s Thus, he reinvented DDI concept In 2003, conference presentation impressed FHWA FHWA finished studying DDI in 2005

14 Double Crossover Diamond (DCD) Interchange An alternative interchange to conventional diamond interchange Gilbert Chlewicki reinvented DDI concept First DDI in United States opened to traffic on June 21, 2009 in Springfield, Missouri connecting SR 13 to I-44. Currently, over 100 locations in the United States

15 I-270 and Roberts Road - Franklin County SR 25 and I-475, - Perrysburg, Wood County I-75 and Union Centre Blvd. (Design)

16 Safety Fewer collisions than traditional interchanges CMF=0.67 (overall) Reduced collision severity versus traditional interchanges CMF=0.59 (injury crashes) Fewer conflict points, especially crossing conflicts Medians and geometry provide traffic calming Opportunity to safely accommodate pedestrians through interchange May reduce wrong way movement potential for highway ramps

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18 Safety Fewer collisions than traditional interchanges CMF=0.67 (overall) Reduced collision severity versus traditional interchanges CMF=0.59 (injury crashes) Fewer conflict points, especially crossing conflicts Medians and geometry provide traffic calming Opportunity to safely accommodate pedestrians through interchange May reduce wrong way movement potential for highway ramps (angle) Traffic Operations 2 phase signal operation Two phase signals reduce lost time at interchange and increases capacity Increases turn movement capacity - Left-turns onto interstate may be free flowing

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20 Cost & Impact Context sensitive (Retrofit interchange = cost savings) Generally fits within existing interchange ROW and bridge structure High delay savings per dollar expended, exceeds cost in few years Smaller footprint Free or simplified left turn movements (intuitive) Bike & Pedestrian Short at grade crossings Relatively simple pedestrian crossing in the middle Eliminates crossing of unprotected free flow ramp

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23 Drivers unfamiliarity (Driving on wrong-side) May have potential for wrong-way maneuvers at crossovers (angle) Potential headlight glare from opposing traffic Highway re-entry eliminated (but does accommodate u-turns) Increased operational challenges at adjacent intersections Little space for snow storage

24 Consider a DDI if: Heavy ramp traffic and light through traffic Heavy through traffic and light ramp traffic Do not consider a DDI if: Heavy ramp traffic and heavy through traffic

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30 Intersection Approach No - Build Build Delay LOS Delay LOS I-75 Southbound Ramp EB 71.7 E 11.2 B WB 70.6 E 29.9 C NB/SBLT N/A N/A 17.3 B SB/SBRT 70.5 E 31.5 C Overall 70.7 E 23.8 C I-75 Northbound Ramp EB 26.2 C 17.9 B WB 37.4 D 29.2 C NB/NBRT 36.9 D 29.0 C SB/NBLT N/A N/A 31.1 C Overall 33.6 C 26.3 C

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32 Intersection Approach No - Build Build Delay LOS Delay LOS I-75 Southbound Ramp EB F 76.0 E WB 65.0 E 78.8 E NB/SBLT N/A N/A 33.1 C SB/SBRT F 15.1 B Overall F 66.5 E I-75 Northbound Ramp EB F 17.4 B WB F 53.6 D NB/NBRT F 15.6 B SB/NBLT N/A N/A 54.2 D Overall F 38.3 D

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34 Crossover Angle - 41 Lane width in curves 14

35 Crossover Angle - 41 Lane width in curves 14 Traffic Control Pavement Marking Guide Signs Ramp Metering Transmission Tower

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37 Crossover Angle - 41 Lane width in curves 14 Traffic Control Pavement Marking Guide Signs Ramp Metering High Tension Tower MOT Cost

38 MOT is critical Positive public perception Impacts to business and traveling public Converting existing interchange to DDI largest challenge Which movements are crucial? Which can be temporarily closed? Which can be re-routed? Full closure necessary Expedite signal pole delivery Positive 1 st impression

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