If you’re a regular reader of Architect This City, you’ll know that I’m a big supporter of public transit. And that’s because, as far as I can tell, it’s the most efficient way of moving lots of people around a big city.

But more and more I’ve been thinking about how technology might change, or even disrupt, this school of thought. Which is why when I wrote this post a few days ago, I was careful to say that private cars aren’t the mobility answer. Because in reality, cars likely aren’t going to go away. We’re just going to use them differently.

Here are the two things I’m thinking about most:

1. Driverless cars

I’ve written about driverless cars before in terms of how they might be used as a form of public transit. But I think it’s worth revisiting them for a moment. There are lots of driverless car critics out there and they usually fixate on the fact that a car is still a car, whether or not you happen to be driving it. It still takes up the same amount of space in our cities. Or does it?

The key thing to keep in mind is that when we’re not longer driving the vehicle, it opens up lots of different possibilities in terms of how they might be used and also how they might be designed. I was watching this fireside chat with the founders of Google the other night and, for them, driverless cars offer the possibility of solving two big problems: traffic and parking.

We know that parking takes up a lot space in our cities. But that’s really symptomatic of the fact that the utilization rate for most people’s cars is incredibly low. Most of the time a car is sitting parked and idle. But with driverless cars, they’ll be able to drop you off at your destination and then continue on to pick up their next ride–thereby minimizing the need for all that parking.

This would bring the utilization rate way up for each car, which would also minimize the number of absolute cars that we’d need to have in our cities to move everybody around. Of course, this would mean that we’d be sharing cars. People wouldn’t own cars; they would be an on-demand service.

2. Networked vehicles

This brings us to my second point: driverless cars will be networked cars. Again, I’ve written about this before, but I specifically wanted to raise it again because of a new service that Lyft just launched in San Francisco called Lyft Line.

The way it works is simple. You input where you’re going and Lyft will match you up with others who are going to more or less the same destination. The routes get shared and this brings down the costs to everyday use. It runs on the same principles as the on-demand minibuses I wrote about in Helsinki.

But if you combine this with driverless cars, you’re starting to get at something incredibly interesting. Now all of sudden you’re getting the door-to-door convenience of private cars with many of the efficiencies of public transit.

So in my mind, it’s very possible that platforms like Uber, Hailo, and Lyft could became major infrastructure backbones in a world of driverless cars. And if you think about it in this context, then I don’t think the valuations for these companies should seem all that surprising. These are potentially huge innovations.

In the end, I don’t know how this will all shake out. I don’t think anybody does. I believe that strong public infrastructure (such as subways, light rail, and so on) will still be needed in big cities, but I’m starting to think that mobile apps and driverless cars will also form a big part of how we get around. Probably more so than most people think today.

Image: Flickr

I’m a big believer in public transportation. I generally believe that the only way to build a big, efficient, and sustainable city is on the backbone of a good transit system. But at the same time, I’m open to fresh ideas. And I’m concerned with the inability of most cities to actually build transit in a way that meaningfully responds to demand.

So what are the alternatives?

The first thought that comes to mind is the delivery system itself. Some cities, such as Hong Kong, have successfully combined transit delivery with real estate development as a way to improve the economics behind building transit. And I think that makes a lot of sense.

But my other thought is that maybe the solution to urban mobility is something completely new. Maybe Google is on to something with their driverless cars. Is that the future? Many would disagree.

We’ve established that cars don’t work all that well for getting people around in big congested cities. So what difference would it make whether or not the cars have a driver or not? Well, I was thinking about this last night and there are some meaningful differences.

A network of driverless cars would give us perfect information about all to the cars on the road. Similar to to how Google’s Waze navigation app feeds off user input (both active and passive), we’d know the exact number of cars on the road and the precise point in which additional cars would cause a drop in efficiency (i.e. a reduction in vehicle speeds).

At the same time, it could enable a powerful sharing economy. In a recent study done by MIT’s Senseable City Lab, it was found that roughly 80% of New York cab rides could be shared. That is, 80% of the time there’s somebody else who’s also traveling from roughly the same point A to the same point B.

So here’s what I’m thinking.

You use Google’s driverless car technology and the perfect information you get from the networked vehicles to create a fluid and ever-evolving transit network. What I’m imagining is that the driverless vehicles don’t operate based on a model of individual mobility; they instead operate on a principle of batched mobility.

Let’s say for example that there are critical mass of people who want to leave Liberty Village between 8:00am - 8:30am to travel to the Financial District. What they would do is enter this itinerary and then a “station” would get formed somewhere nearby. Users would get notified of the station’s location, which would be determined based on proximity to the highest concentration of “riders.”

The driverless cars would then get notified and would begin assembling the appropriate number of vehicles at the selected station location. As is the case with conventional forms of public transportation, most people would need to walk to the station. But never that far.

In essence, it would function as a cross between private and public transportation. You would get the economies of scale generated by public transit, with some of the individual conveniences of private transportation.

How does that sound?

Every time I bring my car in for service, I’m reminded of how expensive it is to maintain one. Between car payments, insurance, gas, parking in the city and service, owning a car eats into a lot of disposable income.

So for cities where the residents don’t need a car to get around, there’s potentially a lot of additional income that can get placed in other sectors of the economy.

Richard Florida, and others, have argued that we’ve historically been overspending on housing and transportation, and that it restricts capital from flowing into other, more productive, areas of the economy.

I’d be curious to see a study that compares transportation spending versus other local economic measures. How would a driving city compare to a public transit or biking city?