Offset Single Point Interchange I-25 at Rio Bravo Boulevard Albuquerque, New Mexico INSTITUTE OF TRANSPORTATION ENGINEERS 2016 WESTERN DISTRICT MEETING JULY 11, 2016 7/11/2016 1
Project Vicinity Map 7/11/2016 2
Background Existing Interchange constructed in 1960 s Rio Bravo Blvd. provides key crossing of Rio Grande in south Metro Area Significant growth ongoing and forecast for Albuquerque s SW Mesa and Mesa del Sol Mesa del Sol Traffic Significant œ 2040 Population Forecast 80,000 residents œ Internal Capture Rate? Includes RR Spur Track and Canal Crossings 7/11/2016 3
Impact of Mesa del Sol 7/11/2016 4
Existing Conditions (to East) 7/11/2016 5
Existing Conditions (to West) 7/11/2016 6
Project Needs and Purpose Physical Deficiencies œ Existing Interchange constructed in 1969 Roadway Capacity œ Poor Levels of Service with current traffic volumes œ No available capacity for traffic growth Safety œ Numerous crashes related to congested roadways (rear-end and angle / left turn crashes) Multi-Modal Connections œ No Bike or Pedestrian facilities through the Interchange 7/11/2016 7
Opportunities andconstraints Hard to Predict Traffic Growth associated with Mesa del Sol Planned Community Heavy Truck Traffic (7%) Rolling Terrain with Steep Grades (6-7%) Adjacent Airport & Runway Close Spacing of Existing Intersections Utilities (Transmission Lines, Cell Tower) Governor s Top Priority List Project Funded for Conventional Solution 7/11/2016 8
Opportunities and Constraints Alternatives Considered and Eliminated œ Diverging Diamond, Roundabout Diamond, etc. Requests from Public for Something Better NMDOT Interested in Innovative Solutions Available Right of Way asymmetrical width, 450 ft. west of CL, 150 ft. east of CL Opportunity to Improve Intersection Spacing (820 ft. to 1280 ft.) Located in Urbanizing Area 7/11/2016 9
Interchange Alternatives Evaluated 7/11/2016 10
Interchange Alternatives Evaluated 7/11/2016 11
2040 DESIGN HOUR VOLUMES Eastbound Rio Bravo: 75% to I-25, 25% to University Northbound University to Northbound I-25 Low Demand on Ramps to/from South 7/11/2016 12
2040 DESIGN HOUR VOLUMES Eastbound Rio Bravo: 70% to I-25, 30% to University Southbound I-25 to Southbound University Low Demand on Ramps to/from South 7/11/2016 13
Traffic Performance Comparison AM PEAK PM PEAK Intersection Intersection Interchange Alternative Delay Max V/C Delay Max V/C Standard Diamond (both terminals) 38 1.00 56 1.24 Single Point Diamond 18 0.92 63 1.21 Offset Single Point, At-Grade 15 0.91 32 1.03 Offset Single Point, Grade Sep. 9 0.79 19 0.90 Results for Both Sides of Interchange Wanted Something Better Grade-separated Option Clearly Best 7/11/2016 14
Dilemma and Innovation Grade Separated Option Unaffordable How Can the OSP At-Grade Option be modified to improve traffic performance? Focus on Eastbound Rio Bravo 1. Bike Crossing of EB-to-NB movement (cycle track?) 2. Lane Utilization Unequal distribution of traffic among the multiple lanes of a lane group 7/11/2016 15
Lane Utilization Channelization Unbalanced use of lane and signal capacity Applied the High T intersection concept Channelized traffic destined to NB I-25 Allows Simultaneous Signal Phases 7/11/2016 16
Channelized Offset Single Point 7/11/2016 17
Offset Single Point Signal Phasing 7/11/2016 18
Traffic Performance Comparison Rio Bravo Blvd @ Offset Single Point AM PEAK HOUR OSP At-Grade Cycle Length (sec) Lanes Eastbound Westbound Northbound Southbound Intersection Delay (veh/sec) LOS Delay (veh/sec) LOS Delay (veh/sec) LOS Delay (veh/sec) LOS T T T T R L L T T L R L L L R Delay (veh/sec) LOS Max V/C High V/C Movements 120 12 B 16 B 30 C 29 C 21 C 0.91 SB L OSP Grade-Sep Loop Ramp Lanes T T R L L T T L R L L L R 120 8 A 3 A 26 C 23 C 12 B 0.79 - Channelized OSP At-Grade Lanes T T T T R L T T L R L L R R 120 15 B 18 B 70 E 15 B 20 B 0.83 EB T to Loop PM PEAK HOUR OSP At-Grade Lanes T T T T R L L T T L R L L L R 120 42 D 20 B 27 C 44 D 39 D 1.03 SBL, EB T OSP Grade-Sep Loop Ramp Lanes T T R L L T T L R L L L R 120 46 D 13 B 23 C 29 C 23 C 0.95 - Channelized OSP At-Grade Lanes T T T T R L T T L R L L R R 120 25 C 25 C 68 E 25 C 27 C 0.97 SB L 7/11/2016 19
Pedestrians and Bicyclists 7/11/2016 20
Northbound I-25 Entrance Ramps 2040 Design Year Traffic High for Both On-Ramps On-Ramp demand distributed better with less delay Better Accommodation of Heavy Trucks; Eastbound and Westbound 7/11/2016 21
Simulation Looking Southeast 7/11/2016 22
Simulation Looking East 7/11/2016 23
Simulation Looking North 7/11/2016 24
Simulation Looking West 7/11/2016 25
Other Issues / Concerns Budget / Estimate œ $50M Total Project Cost Higher Cost than originally budgeted ($36M) Construction Phasing œ Complex 6 Phases, Regional Detours & Closures Railroad Crossing Coordination œ Owned by USAF 7/11/2016 26
Contacts AECOM œ Pete Hinckley, PE œ Office: (505) 855-7409 œ E-mail: peter.hinckley@aecom.com WSP PB œ Jim Heimann, PE, PTOE œ Office: (505) 878-6529 œ E-mail: heimann@pbworld.com 7/11/2016 27
Project Website Project website address: http://www.i25riobravo.com Drive-thru Simulation QUESTIONS / COMMENTS 7/11/2016 28