A driverless car is a much more complicated problem than a driverless airplane, because there's not a lot of traffic up there in the air. You're asking a very good question, and that's why it's going to take a very long time before we get to the point where, on the major streets of our cities, we're going to see these cars driving around willy-nilly. We'll probably take quite a number of years, maybe 20 to 25 or something of that nature.
In the meantime, what I believe will happen will be like what Google is doing right now with cars in a suburb of Tempe, Arizona. It's a very flat area, and there's not a lot of weather. The streets are big and wide, and they're just trying it out. They're being extremely conservative about how they roll this technology out.
The way that's likely to happen in Canada, where we have the additional weather factors to consider, is that we will see it initially in very limited areas that are highly geographically bounded, where the vehicles have a lot of information about the 3-D mapping of the streets down to the millimetre level, or at least the sub-centimetre level. It's going to take time.