Post on 29-Jan-2016
November 5, 2010
ITSO Trans TalkITSO Trans Talk
Vern Swing, P.E. & Steve Manhart, P.E., PTOE, PTPVern Swing, P.E. & Steve Manhart, P.E., PTOE, PTP
November 5, 2010 -- University of MinnesotaNovember 5, 2010 -- University of Minnesota
DIVERGING DIAMOND INTERCHANGEDIVERGING DIAMOND INTERCHANGE (DDI) DESIGN(DDI) DESIGN
Presentation OutlinePresentation Outline
• Interchange Types• Case Study - Elk Run Interchange• Diverging Diamond Interchange
• Design Characteristics• Advantages• Use in North America
• Questions
Interchange TypesInterchange Types
• Basic Diamond
Interchange TypesInterchange Types
• Diamond System Interchange
Interchange TypesInterchange Types
• Full Cloverleaf
Interchange TypesInterchange Types
• Partial Cloverleaf (Parclo)
Interchange TypesInterchange Types
• Partial Cloverleaf (Parclo)
Interchange TypesInterchange Types
• Trumpet
Interchange TypesInterchange Types
• Directional T
Interchange TypesInterchange Types
• Single-Point Urban Interchange (SPUI)
Interchange TypesInterchange Types
• Roundabout
Interchange TypesInterchange Types
• Large Radius Roundabout
Interchange TypesInterchange Types
• Diverging Diamond Interchange
Diverging Diamond Interchange (DDI)Diverging Diamond Interchange (DDI)
• Springfield, MO
Diverging Diamond Interchange (DDI)Diverging Diamond Interchange (DDI)
Diverging Diamond Interchange (DDI)Diverging Diamond Interchange (DDI)
Diverging Diamond Interchange (DDI)Diverging Diamond Interchange (DDI)
Diverging Diamond Interchange (DDI)Diverging Diamond Interchange (DDI)
Diverging Diamond Interchange (DDI)Diverging Diamond Interchange (DDI)
Diverging Diamond Diverging Diamond Interchange (DDI)Interchange (DDI)
Diverging Diamond Interchange (DDI)Diverging Diamond Interchange (DDI)
Diverging Diamond Diverging Diamond Interchange (DDI)Interchange (DDI)
Diverging Diamond Interchange (DDI)Diverging Diamond Interchange (DDI)
Diverging Diamond Diverging Diamond Interchange (DDI)Interchange (DDI)
Diverging Diamond Interchange (DDI)Diverging Diamond Interchange (DDI)
Diverging Diamond Diverging Diamond Interchange (DDI)Interchange (DDI)
Interchange Conflict PointsInterchange Conflict Points
Intersection Conflict PointsIntersection Conflict Points
Diverging Diamond Interchange (DDI)Diverging Diamond Interchange (DDI)
• AdvantagesAdvantages• Improved Safety• Operationally More Efficient• Expandability• Can be more cost-effective (especially
when retrofitting an existing diamond interchange to DDI)
Case Study: TH 52Case Study: TH 52
• Elk Run Interchange Project• Interchange Design Project• Estimated Cost: $36 Million Total Project
Cost
Elk Run Interchange ProjectElk Run Interchange Project
• Project Development Area
Elk Run Interchange ProjectElk Run Interchange Project
• Mn/DOT S.P. 2505-48 (TH 52)
Elk Run Interchange ProjectElk Run Interchange Project
• Mn/DOT S.P. 2505-48 (TH 52)
Elk Run Interchange ProjectElk Run Interchange Project
• Mn/DOT S.P. 2505-48 (TH 52)
Elk Run Interchange ProjectElk Run Interchange Project
• Mn/DOT S.P. 2505-48 (TH 52)
• Interchange Options Considered
• Large Radius Roundabouts• Smaller Radius Roundabouts• Single-Point Interchange• Diverging Diamond Interchange - DDI
(NOTE: FHWA refers to DDI as Double Crossover Diamond – DCD)
DDI Proposed Layout at Elk RunDDI Proposed Layout at Elk Run
DDI Proposed Layout at Elk RunDDI Proposed Layout at Elk Run
Diverging Diamond Interchange (DDI)Diverging Diamond Interchange (DDI)
Q) Are there headlight concerns, since traffic is
directly in front of each other before the crossovers?
A) No. The direct headlight approach is a further distance
than a common scenario where a left turn lane is directly
opposite the opposing left turn. The headlights do not affect
the crossover movements since vehicles are angled away from
each other at the crossovers. Putting up any type of headlight
shields (also known as glare screens) on the curb is ill-advised
since there will be a in safety due to poor sight distance.
SYNCHRO/SimTraffic Analysis of DDISYNCHRO/SimTraffic Analysis of DDI
SYNCHRO/SimTraffic Analysis of DDISYNCHRO/SimTraffic Analysis of DDI
Proposed Elk Run DDIProposed Elk Run DDI
• Findings• Mn/DOT proposed diamond interchange
layout reaches maximum capacity at 40% build-out.
• Proposed DDI layout reaches maximum capacity at 79% of build-out.
►DDI Concept was ultimately selected by Mn/DOT.
DDI from the Air – Springfield, MODDI from the Air – Springfield, MO
Driving a DDI – Springfield, MO Driving a DDI – Springfield, MO
Use in North America Use in North America
• I-44 & MO-13, Springfield, MO• I-15 & Main St, American Fork, UT• I-15 & 500 East, American Fork, UT• I-70 & Woods Chapel Rd, Kansas City, MO• I-435 & Front St, Kansas City, MO• Botts Rd & M-150, Kansas City, MO• I-270 & Dorsett Rd, St. Louis Co, MO• Along Baltimore-Washington Pkwy,
Anne Arundel Co, MD• Hwy 427 & Rathburn Rd, Toronto, ON• I-5 & Fern Valley Rd, Phoenix, OR
• New Circle Rd Interchanges, Lexington, KY• I-590 & Winton Rd, Rochester, NY• I-75 & US 224/SR-15, Findlay, OH• I-480 & Tiedman Rd, Brooklyn, OH• Ashford-Dunwoody Rd Interchange,
Atlanta, GA• 8 Interchanges in/around Atlanta, GA• West Catawba/Exit #28, Charlotte, NC• I-95 & Thurbers Ave, Providence, RI• IL-59 & I-88, Naperville, IL• US-129 Bypass / Bessemer St/ Middle-
settlements Rd Interchange in Alcoa, TN
Questions? Questions?
Vern Swing, P.E.Principal Transportation Engineer/PresidentRLK Incorporatedvswing@rlkinc.com
Steve Manhart, P.E., PTOE, PTPSr. Transportation Engineer IIRLK Incorporatedsmanhart@rlkinc.com
6110 Blue Circle Drive, Suite 100Minnetonka, MN 55343
952-933-0972
www.rlkinc.com