The Driverless Digest Podcast

The Robotaxi Curb Dilemma: Park, Cruise or Return to the Depot?

The Driverless Digest Podcast

Show Notes

Thanks to Jonah Bliss for originally covering this on The Curbivore - Let Them Linger? The Surprising Case for Robotaxis at the Curb In a new study, Associate Professor Michael Hyland at UC Irvine explains why giving robotaxis somewhere to wait between rides could be crucial to avoiding unnecessary miles on city streets. Where should a robotaxi go after dropping off a passenger? It could wait at the curb, head back to a depot or it could simply keep moving. A new study from researchers at UC Irvine and UC Berkeley examines what happens when shared autonomous vehicles are prevented from resting (otherwise known as staging) at the curb in San Francisco. The researchers simulated a fleet of 1,700 robotaxis serving 68,000 daily trips. In the no-staging scenario, the fleet traveled 564,650 kilometers per day. Allowing the vehicles to stage at the curb reduced daily vehicle miles traveled (VMT) by nearly 60%. Michael Hyland, Associate Professor of Civil and Environmental Engineering at UC Irvine and one of the researchers behind the study, spoke to The Driverless Digest Editor Ben Hubbard about why curb access matters for robotaxis, how cities should manage valuable curb space, and what the rise of personally owned driverless vehicles could mean for congestion. The Driverless Digest: Tell us about your role? Michael Hyland: My research is broadly on modeling and analyzing transportation systems. I tend to focus on innovations in the transportation space, such as driverless vehicles, both in terms of shared fleets and personally owned, but also technologies like e-scooters, e-bikes, ride-hailing and micro-transit. My work involves how to operate these systems efficiently, how to design them effectively, and then I also try to understand their impact on people living in cities. You’ve recently conducted a pretty comprehensive study on managing curb usage. Can you explain the experiment and what you set out to understand? The idea was to test the impact of banning shared automated vehicles from using the curb. So this is not when they pick up and drop off passengers, but for what we call staging or parking between one drop-off and the next pickup. Essentially, the time when the vehicle doesn’t have anything to do. The main result, of course, is that it has pretty big implications on what these vehicles do with their time. When they can’t stage, they just circle around the transportation network. In this case, they dramatically increased vehicle miles traveled on the roadway network in San Francisco. We don’t model congestion in our study, but the implications for congestion, I think, are somewhat obvious directionally. It would make congestion worse, most likely in some of the most congested parts in San Francisco. We ran some other scenarios related to weekends versus weekdays, preventing vehicles from staging at night versus only during the day. Most of the results were pretty similar. If you’re strategic with where you ban the robotaxis from using the curb, the size of the VMT impact is much smaller, but there still is an adverse impact. Plenty of people have probably wondered where an AV goes after it has dropped off a passenger. Do they just drive around in circles? Do they wait? Could you explain how this study came about because I can imagine this is going to become a really important topic when AVs take off. Yeah, that’s right. As there are more fleets, the impact will be much larger. The study actually came from Waymo reaching out to us here at UC Irvine via Susan Shaheen’s group at UC Berkeley. They knew we did modeling and they asked us to interview stakeholders in cities to understand how they’re thinking about regulating the curb and using the curb for not just robotaxis but also Uber and Lyft-type vehicles, and micromobility too. They came to us and said, “Hey, we think it’s mutually beneficial for us at Waymo and for cities for our vehicles to be able to use the curb when we’re not serving passengers,” as opposed to just

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Oct 19, 2026

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