Superstreets. A Tool for Safely and Efficiently Managing Congestion
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1 Superstreets A Tool for Safely and Efficiently Managing Congestion Prepared for NORTH CAROLINA DEPARTMENT OF TRANSPORTATION TRAFFIC ENGINEERING AND SAFETY SYSTEMS BRANCH Original Superstreet Presentation Created By Stantec Consulting Services Inc.
2 NC Department of Transportation Mission Statement Connecting people and places in North Carolina - safely and efficiently with accountability and environmental sensitivity.
3 The Superstreet A type of intersection in which minor cross-street traffic is prohibited from going straight through or left at a divided highway intersection. Minor cross street traffic must turn right, but can then access a U-turn to proceed in the desired direction. *Other configurations possible based on site specific conditions.
4
5
6 Why Superstreets?
7 Answer: Improved Safety Less Travel Time Economically Beneficial Environmentally Responsible
8 Why Superstreets? Improved Safety Reduced likelihood of crashes, especially severe crashes such as sidecollisions Fewer threats to crossing pedestrians
9 Rural Expressway - US 17 Brunswick Co.
10 Rural Expressway - Full Movement Median Crossover
11 Long distance to cross main corridor may take more time than the gap motorists are able to choose ~120
12 So we build an interchange
13 Conventional Intersection Conflict Points Improved Safety
14 Superstreet Conflict Points Total Conflict Points = 14 Improved Safety
15 Total Intersection Conflict Points Conventional Intersection Crossing Conflicts Superstreet Intersection 14 2 Crossing Conflicts Improved Safety
16 NC 87 at Peanut Plant Road NC 87 at SR 1150-Peanut Plant Road NC 87 at US 701 NC 87 Bypass was opened in Total Crashes and 5 Fatal Crashes in 8 Years after completion
17 NC 87- Peanut Plant Road Collision Diagram
18 Traditional Solution - Install Traffic Signal
19 NC 87- US 701 Collision Diagram Traffic signals don t always solve the problem, they may just create a different problem!
20 NC 87 - Original Superstreet Proposal
21 NC 87 at Peanut Plant Road Final Superstreet Configuration
22 NC 87 at Peanut Plant Road 3 years before 24 crashes, 21 injury crashes 3 years after 2 crashes, zero injury crashes
23 Superstreet Benefits and Capacities (Research Project )
24 Reduction in Crashes Safety impact by collision type for unsignalized superstreets, % Collision Type Crash Reduction % Total -46 Fatal and injury -63 Angle and right turns -75 Rear ends -1 Sideswipes -13 Left turns -59 Other -15
25 Safety Conclusions Unsignalized superstreets: Reduced collisions for total, angle and right turn, left turn, and fatal and injury Total collisions reduced by 46% (C-G method)
26 Are U-turns safe?
27 Accidents related to U-turn and leftturn maneuvers at unsignalized median openings occur very infrequently The 12 median openings in rural arterial corridors evaluated in detail in this research experienced an average of 0.20 accidents per median opening per year Based on these limited accident frequencies, there is no indication that U-turns at unsignalized median openings constitute a major safety concern.
28 Why Superstreets? Less Travel Time Reduced wait time or delay Increased roadway capacity
29 Less Travel Time
30 Main Street Green Time Signal Timing - Two Phase Signal Timing - Three Phase Signal Timing - Eight Phase Less Travel Time
31 Less Travel Time Superstreet Phasing
32 Capacity/Delay Improvements Increased roadway capacity Reduced travel delay Improved Signal Coordination Less Travel Time
33 U-4008 US Chapel Hill 42,000 ADT on Four-Lane Expressway 6-Phase Split Side Street Signal
34 U TSIS-Corsim Comparison Before (Traditional Intersection) vs. After (Superstreet Intersection) Traditional Superstreet
35 U-4008 US Chapel Hill Superstreet Project Visualization
36 Benefits Capacity Extend Life of Corridor years 60% reduction in Travel Time 220,000 kg Emissions Reduced Annually Safe Pedestrian Crossing
37 US 281 (San Antonio TX) 2009 Looking south above Evans Road, PM peak
38
39 US 281 Superstreet Comments As traffic congestion on U.S. Highway 281 eases due to the completion of the superstreet project, construction of new commercial and retail developments along the far North Central San Antonio corridor is ramping up. We are close to 90 percent leased with no pad sites left, Elliott remarked. We've had quite a bit of interest because of the market, which is in a high growth area. And a lot of our tenants say they feel like business has increased since the superstreet was finished. San Antonio Express-News March 17, 2011
40 Why Superstreets? Economically Beneficial Preserves the existing facility Less expensive than an interchange Provides good access to both sides of the main road for development
41 Economically Beneficial
42 Economically Beneficial
43 UPS Expects To Save $600 Million by Favoring Right Hand Turns Economically Beneficial NPR Jan. 24, 2007
44 Why Superstreets? Environmentally Responsible Less time spent idling at a red light Reduction in environmental pollutants (exhaust fumes / fuel usage) Less acreage impacted by construction and permanent facility
45 Can Superstreets Accommodate Semi-Trailer Combinations?
46 ABSOLUTELY!
47
48 Unsignalized
49 Signalized
50 Variations of Superstreet Design 1. Leftover with median U-turn 2. No direct lefts 3. Michigan Median Left 4. Left-out Intersection 5. Offset T Intersections
51 Leftover with Median U-turn
52 No Direct Lefts
53 Michigan Median Left
54 Left-out Intersection
55 Offset T Intersections
56 Superstreets in North Carolina Selected Existing Locations US 15/501 in Chapel Hill, Orange County (Signalized) US 17 in Pender & New Hanover Counties (Signalized) US 17 in Leland, Brunswick County (Signalized) US in Haywood County US 1 in Moore County, Vass Bypass NC 87 in Elizabethtown, Bladen County US 601 in Union County US 17 By-Pass in Martin and Beaufort Counties Proposed Locations Extensions to the superstreets in Brunswick & Pender Counties Poplar Tent Road, Concord (Cabarrus County) NC in Mecklenburg County Over 60 TIP Projects throughout the state
57 Summary of Superstreet Benefits Safety Time savings Increased capacity Improved traffic flow Access management Land use and corridor protection Alternative to interchange (Less $$$) Smaller footprint than an interchange
58 US 281 Superstreet Comments Superstreet, I'm sorry I doubted you Joy! The wonks have won my heart with a time-saving traffic plan that works! When people around here first began talking about you, I rolled my eyes. What, don't they see the endless sea of rush-hour traffic north of Loop 1604 where it meets U.S. 281? A few U-turn lanes are going to help? Ah yes only a superstreet can save us now, I scoffed. And then it started to happen. Friends and neighbors compared notes; traffic that used to take an hour and a half out of their days took 30 to 45 minutes, maybe. Commutes got shorter. Afternoon outings became quick trips. I couldn't believe how quickly one could motor up from the Northwoods Shopping Center to the Target on Stone Oak during the height of the silly shopping season. I know it was you, superstreet. Now I know you and applaud you. And I don't understand why we didn't have you sooner. Don't get me wrong I'm not naïve enough to believe that you're the answer to all the trafficky problems that loom in the future of the growth area. Sprawl will continue, and so will congestion. I know there's only so much that you and your turning lanes can do. You're not a freeway or GASP! a toll road. But I think the lesson I've learned from all of this and I hope I'm not alone is to keep an open mind. San Antonio Express-News Dec. 26, 2010
59 Thank You!
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