In this episode of Startup Explore, we sit down with Collin Barnwell, CEO and co-founder of Roundabout Technologies, a YC-backed startup building AI-powered traffic lights to make streets safer and more efficient.

Roundabout Tech’s system uses cameras and GPUs to create a 3D real-time map of intersections, simulating traffic 10 times a second to optimize light changes. Their technology helps cities reduce congestion, prevent accidents, and improve travel times - all without replacing existing infrastructure.

We discuss:
- How AI-powered traffic lights simulate and predict vehicle movement in real-time
- Key safety features: Dilemma Zone Protection and Dynamic All-Red Extensions
- How their system adapts to fog, rain, and poor visibility
- Handling emergency vehicles and ensuring software reliability
- Their first deployment in San Anselmo, California, and the results: 30% reduction in rush-hour wait times
- How Roundabout found its first city customer and built trust in a government market
- Collin’s background at Google and Verily, and what it’s like to go through Y Combinator
- The massive market potential - over 330,000 intersections in the U.S. alone
- Roundabout’s long-term vision for safer, smarter cities

If you work in city planning or transportation innovation - or just want to see how AI is shaping real-world infrastructure - this is a must-watch episode.

📩 Interested in pilot programs? Contact Collin via email: collin@roundabout.tech.

📌 Learn more:

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Roundabout Technologies: https://www.roundabout.tech/

Chapters:

00:00 Introduction to AI-Powered Traffic Solutions
01:35 Understanding the Technology Behind AI Traffic Lights
03:43 Safety Features: Dilemma Zone Protection and All-Red Extensions
09:33 Adapting to Weather Conditions and Emergency Vehicles
12:33 Ensuring System Reliability and Accuracy
15:02 Integration with Existing Traffic Systems
17:07 Pilot Programs and Initial Metrics
19:03 Data Privacy and Ethical Considerations
20:12 Challenges in Securing First Customers
23:46 Founders' Background and Company Origins
25:48 Insights from Y Combinator Experience
27:52 Market Potential and Total Addressable Market
28:59 Competition Landscape in Traffic Management
32:03 Future Vision: Evolving Technology and Hiring Strategies
36:46 Personal Insights and Hobbies
38:19 Conclusion and Call to Action

In this episode of StartupExplore, I sit down with Luis Benavides, CEO and co-founder of Neighborbrite, a seed-stage startup using AI to transform landscape design.

Neighborbrite makes it simple for anyone to redesign their yard: upload a photo, choose a style, and instantly generate personalized, climate-aware designs. Luis shares how the company grew to half a million users and 10+ million designs, why focus on the right ICP matters, and how they’re building toward an “operating system for exterior home improvement.”

In this episode of StartupExplore, I talk with Peter Moot, CEO & Co-founder of Promi.ai — a YC-backed, seed-stage startup using AI to personalize pricing discounts for e-commerce retailers.

We dive into:
- How Promi helps merchants boost revenue while protecting margins
- The AI powering real-time discount personalization
- Peter’s journey from Uber to building Promi
- Lessons from YC and what’s next for Promi