It all started with a tweet I sent on February 9, 2012 about an article featured on Wired, "Let the Robot Drive: The Autonomous Car of the Future Is Here":

"If you're still not convinced that driver-less cars are almost there: ("The fact that you’re still driving is a bug")"

To which @avernet replied (noting that "almost" is ambiguous):

"@obruchez Almost here, like voice recognition that works?"

My reply (pinpointing another ambiguity):

"@avernet Define "work" and I'll answer. :) But, more seriously, I think that average voice recognition is way harder than average driving."

A definition of "work" is given:

"@obruchez Let's define "work", very informally, as "you and I use it on a regular basis, and are happy with it"."

I was then asked to predict when speech recognition and driverless cars will be "good enough":

"@obruchez With that, in which year would you predict speech recognition and self-driving car will "work"? #longbets"

This is me thinking out loud:

"@avernet This is tricky. I really feel there's a way bigger gap between "working" speech recognition and "really good" speech recognition..."
"@avernet ...than between "working" self-driving cars and "really good" self-driving cars. Let me think about it."

Finally, here's my prediction:

"@avernet I asked my Magic 8-Ball and here's what I got: speech recognition that "works" -> 2018 and self-driving cars that "work" -> 2024."

My reasoning for speech recognition that works in 2018:

"@obruchez I'd say speech recognition I'd use is just around the corner, but it's been 15 years I say that, so you might be right with 2018."
"@avernet My reasoning exactly ("just around the corner" for years). Plus speech recognition in French is lagging (and that's what I'd need)."

And for driverless cars that work in 2024:

"@obruchez It might be longer for self-driving car. For legal reasons manufacturers won't risk it until they are *much* better than humans."
"@avernet I agree. But we have "working" prototypes right *now*. And humans are really *bad* at driving (>30000 deaths per year in the US!)."

And here's the reason for this blog post (a tweet by @ebruchez):

"@obruchez @avernet We should be tracking those predictions."

So, see you in 2018 for a debate about the meaning of "regular basis" and "happy", and about the reasons why long-term bets are difficult (for more serious examples, see "How My Predictions Are Faring" by Ray Kurzweil). ;-)

Update (August 28, 2012). See the post "Self-driving cars in 2019, report says" on I think I'm being a bit too pessimistic with my prediction (2024).

Update (September 27, 2012). And yet another optimistic article: "Self-driving cars a reality for 'ordinary people' within 5 years, says Google's Sergey Brin" (within 5 years = by 2017, i.e. seven years before 2024 - my prediction).

Update (January 3, 2014). Another more conservative article: "Fully self-driving cars expected by 2030, says forecast" ("Self-driving cars (SDC) that include driver control are expected to hit highways around the globe before 2025 and self-driving “only” cars (only the car drives) are anticipated around 2030").