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Alternative Intersection Treatments_

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This session will review several alternatives to traditional intersections, including continuous-flow intersections, diverging diamond interchanges, protected intersections, and roundabouts. The roundabout presentation will be given from an Australian and New Zealand perspective, where roundabouts have been a common intersection treatment since the 1970s, and it will focus on how roundabouts have developed over the decades, as well as techniques that may be used to address roundabouts with long delays.

Learning Objectives

  • Describe the state of the practice for alternative intersections and treatments
  • Understand various ways to address future problems with roundabouts
  • Understand what protected intersections are and how to lay them out
  • Smith Siromaskul, P.E., P.Eng., Principal Professional Associate, HDR, Inc.
  • Betsy L. Watson, P.E., Senior Principal, Stantec and Dean Sarvis, P.E., Senior Transportation Engineer, Stantec
  • Deborah Donald, Managing Director, O’Brien Traffic
PDH/CM Credits Available: 1.5
To earn your credits, you must view the session and complete the associated evaluation. Once your evaluation is completed, your certificate will be available in your ITE Learning Hub account.


  • Moderator: Cynthia Peck, P.E., PTOE, Project Manager, DLZ Corporation

  • Smith Siromaskul, P.E., P.Eng., Principal Professional Associate, HDR, Inc.

    Smith Siromaskul is a Principal Professional Associate with HDR and leads HDR’s concept development practice group. With over 20 years of experience split between roadway design and traffic analysis and simulation, he has been involved in the planning, design, and construction of numerous innovative intersection and interchange concepts throughout the US, Canada, and Australia.

  • Betsy L. Watson, P.E., Senior Principal, Stantec

    Betsy L. Watson, PE is a 1998 civil engineering graduate of N.C. State University with 23 years’ experience in the transportation industry. Her technical background focuses on signal design, signing, pavement marking, and transportation management. She currently serves as operations lead for the Carolinas and Georgia transportation practice at Stantec Consulting in Raleigh.

  • Dean Sarvis, P.E., Senior Transportation Engineer, Stantec

    A. Dean Sarvis, PE is a 1988 graduate of North Carolina State University and is currently a senior transportation engineer at Stantec with more than 31 years of experience varying from feasibility studies, functional and preliminary corridor alignment evaluations to preliminary right-of-way and final plans. Dean's projects range from bridge replacement designs to new location interstates and interchanges, including diverging diamonds, rural and urban widenings, including superstreets, roundabouts, and continuous flow intersections.

  • Deborah Donald, Managing Director, O’Brien Traffic

    Deborah Donald - Managing Director - O'Brien Traffic (Melbourne, Australia) - After graduating with a Bachelor of Engineering (Civil) in 1983, Deborah worked for seven years at the State Road Authority (VicRoads and its predecessors the CRB and RCA), where she undertook road planning, road design and road construction activities. Deborah then joined ARRB Transport Research as a Senior Research Engineer. During her seven years at ARRB Deborah worked primarily in the traffic engineering and road safety areas, with particular focus on speed limits, traffic signs and road safety audits. Deborah was involved in writing a large number of ARRB Research Reports covering various aspects of speed management and curve warning signs amongst other topics, and was responsible for developing the Easy Audit Road Safety Audit computer software. She was also involved in writing a number of Austroads reports, including Urban Speed Management. In 1997 Deborah joined O’Brien Traffic (then known as Andrew O'Brien & Associates) as a Senior Consultant, and she was appointed an Associate in mid-1999 and a Director in 2007. In 2011 Deborah became Managing Director of the company and this year she celebrates 10 years in the role. Deborah has extensive experience in a very wide range of traffic engineering activities including traffic impact analysis, Road Safety Audits (she is a VicRoads accredited Senior Road Safety Auditor and has undertaken several hundred Road Safety Audits), traffic and parking studies and strategies, traffic sign design, advertising sign assessment, provision of expert evidence at various jurisdictions including VCAT, County Court and Supreme Court, black spot assessments, road safety studies, running technical workshops and in undertaking a wide range of road safety research projects.

March 23, 2021
Tue 4:00 PM EDT

Duration 1H 30M

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