Diverging Diamond & Roundabouts: How to Keep on Trucking Along. Meredith K Cebelak, PhD, PE & Michael A Flatt, PE
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1 Diverging Diamond & Roundabouts: How to Keep on Trucking Along Meredith K Cebelak, PhD, PE & Michael A Flatt, PE
2 Objectives What the Concerns are for Freight? What Factors Go into Good Design? What should be Avoided? How to Balance Innovation & Design with Operations?
3 Why be Concerned with Freight? 2012 Over 54 Million Tons of Goods Moved Along System Worth ~$48 Billion / Day ~ 63 Tons / Person / Year By 2040 Tonnage to Increase by 45% 9 Billion Mores Tons will be Hauled Over 44 Million Jobs Directly Dependent on Freight Last Mile always on a Truck 2045 Source: Freight Facts & Figures 2017, Bureau of Transportation Statistics, USDOT
4 ATRI s Critical Issues in the Trucking Industry (2017) Infrastructure/Congestion/Funding Truck Parking Compliance, Safety, Accountability (CSA) Driver Distraction Road Conditions & Congestion Wear & Tear Waste Fuel & Increase Emissions Additional Stress Congestion-Related Delays Cost ~$63.5 billion (2015)
5 A Look at Trucks & DDIs
6 Innovative Intersections DDIs
7 Innovative Intersections DDIs Good for: Heavy Lefts On & Off Freeway Ramps Moderate, Unbalanced Crossroad Volumes Left Turn Safety Concerns Need for Added Capacity without Widening Good for Retrofit Benefits: Safety! Elimination of Left Crashes Reduction in Right Angle & Rear End Crashes Often Less $$ & Quicker Construction Increased Capacity Reduced Delay & Congestion
8 Innovative Intersections DDIs A Trucking Perspective: Accommodates Large Commercial Vehicles No Issues Navigating Crossroad & Ramps Missouri DDI Survey 83% Felt Maneuvering a Large Truck through was Easy & No Different from Other Interchange Types (Missouri DOT, Diverging Diamond Interchange Performance Evaluation (I-44 and Route 13))
9 Innovative Intersections DDIs
10 Innovative Intersections DDIs
11 DDI: US 129 & W Bessemer St (Alcoa, TN)
12 DDI: US 129 & W Bessemer St (Alcoa, TN)
13 DDI: US 129 & W Bessemer St (Alcoa, TN)
14 DDI: US 129 & W Bessemer St (Alcoa, TN)
15 Innovative Intersections DDIs
16 DDI: I-40 & Winfield Dunn Pkwy (Sevierville, TN
17 DDI: I-40 & Winfield Dunn Pkwy (Sevierville, TN)
18 DDI: I-40 & Winfield Dunn Pkwy (Sevierville, TN)
19 DDI: I-40 & Winfield Dunn Pkwy (Sevierville, TN)
20 Innovative Intersections DDIs Design Considerations Engage Community Early Especially Freight! Detour Routes Typical Design Vehicle Lane Widths Widen Crossover, Turning Movements Single vs Double Path Alignment Straight Through
21 A Look at Trucks & Roundabouts
22 Innovative Intersections Roundabouts
23 Innovative Intersections Roundabouts Good for: Unbalanced Flow High Turning Volumes Reducing Speeds Congestion Benefits: Safety! Reduction of Crashes Reduced Delay, Continuous Flow of Traffic Less Expensive Construction O&M
24 Innovative Intersections Roundabouts A Trucking Perspective: Difficult to Navigate Often Too Small Travel Path Issues Don t Know About Them Routing Issues Roundabouts
25 ATRI Survey - Roundabouts & Large Trucks ~73% More Problematic vs. Other Intersections ~62% Cited Unique Problems
26 ATRI Survey - Roundabouts & Large Trucks Too Small to Accommodate Large Trucks Trailer Encroachment (Center, 2 nd Lane) Running on Curbs Elevated /Sloped Curbs Issues for 90 Turns Difficulty Accelerating to Merge into Traffic Blind-Spots/Distractions Created on Right Side of Truck Center Island Aesthetics Not Well Documented for Routing Purposes Adds Costs $
27 ATRI Survey - Roundabouts & Large Trucks Too Small to Accommodate Large Trucks engineered and constructed so as to be of a size that allows large trucks to fully utilize the circulating roadway without riding the trailer tires over the curb/apron of the roundabout island. At a minimum, these roundabouts must be of a size designed to fully accommodate the offtracking of large truck pulling a 53' trailer that has its tandem wheels in the rearmost position. Increase the diameter of the roundabouts. Add directional signs well ahead of the roundabout. Improve public knowledge of the laws pertaining to roundabouts.
28 Roundabouts - Design Considerations
29 Roundabouts - Design Considerations Too Small/Encroachment One Size Does Not Fit All! Fit the Road Classification & Users Multiple Sizes Circular vs. Irregular shapes
30 Roundabouts - Design Considerations Too Small/Encroachment One Size Does Not Fit All! Fit the Road Classification & Users Multiple Sizes Circular vs. Irregular shapes
31 Roundabouts Design Considerations Too Small/Encroachment One Size Does Not Fit All! Fit the Road Classification & Users Multiple Sizes Circular vs. Irregular shapes
32 Roundabouts Design Considerations Difficulty Accelerating to Merge into Traffic Truck Routes Increased Queue Lengths Increased Delays
33 ATRI Survey - Roundabouts & Large Trucks Blind-spots/Distractions Keep designs free of shrubs, curbs, rocks and signs, and anything that hinders the use of lowboys and other specialized equipment that is currently used to move today's O-D cargoes.
34 ATRI Survey - Roundabouts & Large Trucks Blind-Spots/Distractions Give Trucks Room to Maneuver Yield to Signs that Trucks Need Both Lanes
35 ATRI Survey - Roundabouts & Large Trucks Not Well Documented for Routing Purposes It is necessary for all areas to have a designated truck route. All truck routes should be free of this type of issue We all have to compromise but why does it always have to be the truck driver that has to figure out a way around the problem? Do not build a roundabout anywhere before the state, city and county governments has looked at their long term planning for regional projects both public and private.
36 Innovative Intersections Roundabouts Design Considerations Engage Community Early Especially Freight Detour Routes Right Sizing Typical Design Vehicle Lane Widths Crossover Reverse Curves Turning Movements (Outside Lanes) Curb Choices Straight faced vs. Rolled-raised curb Path Alignment Avoid Encroachment
37 The Future of Trucking DDIs & Roundabouts Connected & Autonomous Vehicles (CAV) Platooning Geometrics Lane & Shoulder Widths Queue Lengths Signal Timings Eco-Traffic Signal Priority Extended Greens ~ 4% Energy Benefit Eco-Speed Harmonization Dynamic Eco-Routing for Freight
38 Conclusions DDIs & Roundabouts: How to Keep on Trucking Along Engage Community Early - Especially Freight! Consider Detour Routes & Planned Land Use Design Typical Design Vehicle Lane Widths Curb Choices
39 Thank You! Any Questions?
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