"Level 3: Within known, limited environments (such as freeways), the driver can safely turn their attention away from driving tasks"

Volvo have announced shipping that in 2017. I don't think anyone else has. (https://www.youtube.com/watch?v=2q00jIBhkq4)

Based on the videos on YouTube, I would say Tesla are already shipping that.

Tesla say you should look where you're going still.

Yes, I believe they have an L2 but are working towards and L4. Google is still going straight for L5, which is the only case where you can fully remove the steering wheel. It's a huge bed, and a bit silly, honestly. I feel like at this point, they've definitely got L4 down.

L4 basically says the car can drive itself without attention in most cases. Driver only needs to take over in extreme cases where the computer can't figure it out (something on the road blocking, sever weather, super abnormal situation).

That's provably false given there's been cases where Teslas have already slammed into other vehicles on freeways.

Volvo has been doing research on self-driving cars for a while, with existing vehicles in operation for research purposes.