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When Will Driverless Cars Be Available to the Public?

When should car buyers -- and investors -- expect driverless vehicles to be available to the public?

It's a question I get asked all the time. That's no surprise: Self-driving vehicles are likely to be a transformative technology, and we Fools love to get in on those early on.

But it turns out that the answer to the question depends on what you mean by "driverless" -- and by "available."

A white Chrysler Pacifica Hybrid minivan with Waymo logos and visible self-driving sensor hardware is shown driving on a street in Chandler, Arizona, earlier in 2017.
A white Chrysler Pacifica Hybrid minivan with Waymo logos and visible self-driving sensor hardware is shown driving on a street in Chandler, Arizona, earlier in 2017.

Waymo, the company formerly known as the Google Self-Driving Car Project, is a leader in the driverless-car race. But it's not yet clear how Waymo will bring its technology to market. Image source: Fiat Chrysler Automobiles.

What we mean by "driverless" cars

First, let's define some terms. "Driverless," "autonomous," and "self-driving" all mean pretty much the same thing: a vehicle that can drive itself with no human intervention required, at least under some circumstances.

There's nothing like that on the market quite yet. While systems like Tesla's (NASDAQ: TSLA) Autopilot and General Motors' (NYSE: GM) Super Cruise do allow hands-free driving under limited circumstances, both require the presence of a human driver who is at least somewhat alert and ready to take over the task of driving on short notice.

SAE International, the professional association of automotive engineers, defines vehicle automation in six steps, from Level 0 (no automation) to Level 5 (full automation). You can learn more about the "levels" here, but for our purposes, Levels 4 and 5 are the ones that are effectively "self-driving."

What's the difference? Level 4 is full self-driving within certain limits: Most of the self-driving systems likely to come to market in the near future are dependent on highly detailed 3-D maps; if you want to go somewhere that isn't on the car's map, you'll have to drive yourself. There may be other limits as well: A Level 4 system might not work in the snow, for instance.

2 Ford Fusions with visible self-driving hardware are shown testing on a snowy road.
2 Ford Fusions with visible self-driving hardware are shown testing on a snowy road.

Snow and ice present big challenges to driverless-vehicle systems. Image source: Ford Motor Company.

Level 5 is a system that can drive anywhere a human driver could. The driverless-car systems likely to come to market in the near future are Level 4, limited to mapped areas. As the maps expand over time, those vehicles will come closer and closer to Level 5. But most experts think a full-blown Level 5 system is at least several years away.

To sum up: For at least the next several years, driverless vehicles will be "geofenced," limited to areas that have been carefully mapped. They may also be limited by weather and other conditions.