Recording: Mini & Modular Roundabouts
On April 28th & 29th, 2026, California LTAP hosted a 2-part training on the benefits of Mini & Modular Roundabouts, presented in collaboration with the Federal Highway Administration (FHWA), Caltrans Division of Local Assistance (DLA), Washington State Department of Transportation (WSDOT), and the cities of Modesto and San Diego.
This 7-hours of presentation and Q&A showcase how these roundabout configurations represent a low-cost, quick construction, and traffic calming solution that will be competitive in the upcoming local Highway Safety Improvement Program (HSIP) Cycle 13 call for projects, anticipated in late May or early June of 2026.
Presentation Topics:
Alignment with Safe Systems & Vision Zero- Impacts on Fatal & Serious Injury Crashes
- Benefits of Mini & Modular Roundabouts
- Peer Sharing of Local Agencies Experience
- Benefit Cost Ratio (BCR) for HSIP applications
- Considering Roundabouts as a First Alternative
Presentation Assets:
- 2-Day Training Agenda
- Roundabouts Introduction, Kelly Mar, Caltrans
- The Safe System Approach, Daniel Burke, Caltrans
- Safe System Intersections, Jerry Champa, Caltrans
- Quick Build Roundabouts, Michael Sacuskie, Modesto
- Introduction to ISOAP, John Liu, Caltrans (retired)
- Compact Roundabouts, Scott Davis, WashDOT
- Prefab Permenant Roundabouts, Phil Rust, San Diego
- Vortex Modular Roundabouts, Adam Lanik, Vortex
- Roundabout HSIP Example, Richard Ke, Caltrans
- Building Consensus, John Liu, Caltrans (retired)
- Communicating Decisions, Scott Davis, WashDOT
Day 1 Agenda:
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Day 2 Agenda:
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Watch the recording below or on our YouTube Channel
Roundabouts
A roundabout is an intersection with a circular configuration that safely and efficiently moves traffic.
Roundabouts feature channelized, curved approaches that reduce vehicle speed, entry yield control that gives right-of-way to circulating traffic, and provide a counterclockwise flow around a central island that minimizes conflict points.
The net result of lower speeds and reduced conflicts at roundabouts is an environment where crashes that cause injury or fatality are substantially reduced.
