Brad Templeton, Google driverless-division consultant, has written a new essay addressing urban density in a time of robocars. An excerpt:

“In today’s cities, there is a ‘downtown’ but there are many other neighbourhood centers, based around an interesting urban street. On that street are shops, restaurants and more, and it is pleasant and productive to walk around them. Houses near these streets are highly valued, and within a block of the cool street real estate values soar. Real estate ads all advertise these places as ‘steps from…’ the cool street. These local centers are space a mile or so apart in medium density urban spaces, a bit more in suburban areas. For those who live more than about 10 minutes, the cool street is more distant, and a destination for walks rather than the place you live.

When you have skyscraper density, as in downtowns and most of Manhattan, there is much greater density of retail streets, and everybody is close to neighbourhood activity and shopping. You just step out of your unit and take the elevator down to be right in the thick of things — a very walkable space. But most cities consist of lots of land with packed single family homes and townhomes, or apartment blocks 2-3 stories high.

The robocar might create something akin to a ‘neighbourhood elevator.’ Imagine a house 3/4 of a mile from the local cool street. In the house is a button. You might press the button and go out. Not that long after you get to the curb, a small robocar pulls up. This is a simple, low-speed model that only goes 30mph. It doesn’t have seatbelts, and is tall and not very aerodynamic. You might just stand in it, rather than sit. You get in and it starts heading towards your neighbourhood center. If you like, you tell it a more specific destination along the street and it takes you there.”