Definitely, these things are subject to differences of opinion in terminology. What I mean is that Tesla's radar produces something like 1-3 1-D arrays as output. Those arrays are probably distance, intensity, and doppler. A normal camera produces three 2-D array of R, G, and B. Something like a Kinect produces arrays of R, G, B, and depth/distance. When one of the parameters is distance, sometimes people talk about a sensor having an extra 0.5D. A Kinect might be 2.5D. In this world, the Tesla radar is 1.5D. Fundamentally though, it can't discriminate by height, and so it can't solve the overpass/overhead sign problem. In a very real sense, that is why these accidents have happened.

I got it later - I'm not used to the terminology, thanks for the explanation :)

So its 2D if it returns a 1D array of distances?

If it returns a 2D array then its 'seeing in 3D'.

So I guess that works out.

Ok, now I understand the confusion. The array is 1-D, but it is a representation of polar coordinates on the 2-D plane. So, the data is 2-D.