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Modern Roundabouts: The Geometric Aspects

Date & Time: 
Thu, 06/19/2014 - 12:00pm - 1:30pm
Location: 
Korda/Nemeth Engineering, Inc., 1650 Watermark Drive, Ste 200 Columbus, OH 43215

*Open only to Central Ohio Section Members
*Seating is limited to the first 25 people
*Bring your own lunch

Purpose and Background
This webinar will focus on the best practices for designing the geometric aspects of roundabouts to maximize the safety of all road users using guidance from the latest publications from FHWA and TRB. About 65% of all crashes in urban areas and 40% of all crashes in rural areas occur at or near intersections or driveways. Safety improvements at these locations have always been a priority and pose a challenge for most transportation agencies. Because crashes are typically complex events, a variety of mitigation measures have been tried with varying degrees of success, including the modern roundabout. This webinar will focus on the best practices for designing the geometric aspects of roundabouts to maximize the safety of all road users using guidance from the latest publications from FHWA and TRB. Case studies will be used to highlight problems that can result from roundabouts that are not designed in accordance with best practices.

RSVP to newsletter@centralohioasce.com by Tuesday, June 17, 2014.

Primary Discussion Topics

  • Geometric aspects of roundabout design
  • The best sources of information about roundabouts
  • The latest FHWA Roundabout Reports and, NCHRP Report 672 and also the research from NCHRP Report 572
  • Three case studies highlighting various issues that arise from improperly designed roundabouts

Learning Outcomes
Participants will become more familiar with the various aspects of the design of geometric aspects of modern roundabouts as discussed in the latest FHWA Roundabout Guide, NCHRP Report 672 and also the research that was reported in NCHRP Report 572. Three case studies will highlight the various issues relating to the design of modern roundabouts and operational problems caused by roundabouts that did not follow the guidance provided in NCHRP 672.

Webinar Benefits

  • Learn how to design various types of modern roundabouts to maximize capacity
  • Understand the key horizontal and vertical geometric design parameters
  • Recognize the relationship of geometry to safety and geometry to capacity from a design perspective
  • Become more familiar with the latest edition of FHWAs Roundabout Guide (NCHRP 672)
  • Learn best practices for handling pedestrians and bicyclists at modern roundabouts

Webinar Outline

  • Right of way impacts
  • Design parameters affecting capacity
  • Relative importance of entry and exit radii
  • Geometric design to reduce path overlap
  • Addressing potential crash patterns
  • Splitter islands
  • Truck aprons
  • Spacing to adjacent traffic signals
  • Sight distance

See the ASCE website for more info.

The Central Ohio Section of ASCE sponsors free continuing education webinars as a service to our members. These webinars are produced by ASCE and normally cost $250 or $300 for ASCE members. However, the Central Ohio Section is paying the registration fee and inviting any interested section members to attend for free. Just RSVP by the deadline. Seating is limited, so do not delay.

You can see the complete list of webinars available from ASCE National on their website. If you see one you like, let us know. If you and your company would like to host one, let us know that too. If you open it up to any interested Central Ohio ASCE section members to come, we will pay the registration fee.