Virtual Learning
Interstate Interchanges - What's What?
- Date: Dec 3, 2025Time: 9:30 - 11:00 am CT; 8:30 - 10:00 am MTDelivery: Live Zoom Webinar (desktop/laptop and mobile devices)
Registration
REGISTRATION DEADLINE: Friday, November 28, 2025
A webinar link will be emailed 2 days prior to the presentation.
For assistance, please refer to our LMS Help — Registering for Upcoming Presentations (PDF, 158K)
Why Attend
This webinar will provide a briefing on the latest trends in interchange design, operations, and safety. From diverging diamonds, single-point diamonds, and roundabouts at interchanges, this session will give an update on the current state of practice across the nation for planning and designing freeway interchanges. Interchange projects are often substantial infrastructure investments and transportation agencies across the country are seeking cost-efficient solutions to address the safety and operational goals for new and reconstructed interchanges. This webinar will present the pros and cons of many common, and some less common, interchange configurations, including discussions on designing for improved mobility for pedestrians and bicyclists in these often-high conflict areas.
Who Should Attend
While all road users can benefit, designers, planners, construction, bridge, and maintenance personnel are the primary audience for this event.
Your Presenter(s)
Mark Doctor is a Senior Engineer with Gresham Smith, a full-service engineering, architecture, and design firm specializing in creative infrastructure solutions grounded in safety and efficiency. Mark joined Gresham Smith in June 2025 after a 37-year career with the Federal Highway Administration (FHWA). For more than 20 years at FHWA, Mark specialized in advancing national practices on freeway interchanges and intersections including roundabouts and other innovative intersections. Mark's background includes a wide variety of roadway design and traffic safety solutions. Since joining Gresham Smith, Mark has served as a technical advisor enhancing client services across multiple office locations. He is a passionate traffic safety advocate with experience relating principles of the Safe System Approach into practical applications for road and intersection designs. He received his Master of Transportation Engineering degree from the University of Florida and a Bachelor of Science degree in Civil Engineering from Clemson University.