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September Luncheon Meeting

Date & Time: 
Thu, 09/25/2014 - 11:30am
Fawcett Center, 2400 Olentangy River Road, Columbus 43210
Diverging Diamond Interchange at I-270 and Roberts Road

Topic: Roberts Road Diverging Diamond Interchange (DDI)

(Online registration and payment available, see bottom of page.)

A congested interchange in the midst of a heavily traveled industrial, commercial, and residential area has received a major overhaul. The previous diamond interchange at I-270 & Roberts Road in Columbus, Ohio has been transformed into a Diverging Diamond Interchange (DDI) – an emerging and cost effective roadway solution designed to improve safety, reduce crashes, and ease congestion. It is the first DDI constructed in the state of Ohio and was the 23rd in the United States.

The previous diamond interchange had geometric design deficiencies and a high frequency of congestion-related crashes. The former interchange also couldn’t handle the high volume of traffic that travels through it – including a large amount of trucks that drive area commerce.

Some key components of the I-270/Roberts Road DDI include:

  • No right-of-way acquisition
  • No environmental impacts
  • Dedicated bike lanes through the interchange – first in the U.S.
  • Dual turn lanes for large trucks
  • Design of DDI merged with a maintenance design project for the overhead bridges that was already underway
  • Extensive public involvement and education process
  • Full closure of the bridges through the interchange; four-month construction schedule
  • $10.6M construction cost

This presentation will discuss the intricacies of the planning effort, the key aspects of the design, and lessons learned during both design and construction. As the Project Manager of the design team, Mr. Toombs will provide insight about design and construction, including lessons learned during various points in the process.

Brian Toombs, P.E.
Burgess & Niple

11:30 AM – Registration
12:00 PM – Lunch

Fawcett Center, The Ohio State University, 2400 Olentangy River Rd, Columbus, OH 43210 ~ (614) 292-1342

Menu: Boxed lunch, Please specify if a Vegetarian lunch is desired.

CPD Hours: A certificate for one (1) Continuing Professional Development (CPD) hour will be issued at the conclusion of the program.

$20 – ASCE & ECC Members and Guests
$15 – ASCE Life Members
$10 – Students

Reservations: Please register and pay online with a credit card or RSVP to Carlos Vazquez at or 614.634.7132. If you have any questions, please contact Carlos. Checks should be made payable to “Central Ohio ASCE.”

Registration is due by 5 PM on Friday, September 19, 2014.

Please note: Late registrations and walk-ins may not be accepted. Registration fees may still be required for no-shows.

Click here for online payment.