I'll have to take 17.34 out again which I got last night... from a couple hundred miles driving yesterday on 17.32.6 I noted that AP2 was generally ok on the motorway, but I still got two random braking events - one quite severe - no bridge or sign or anything to trigger it, so no idea what that was about - fortunately the car behind me was a safe distance and reacted - and from then on kept a very safe distance from me - don't blame him!
A few weird behaviours in that firmware, I'm hoping 17.34 fixes:
1) For some reason the car slows down when the car in front changes lane, before speeding up to pass it. Say that TACC is on 80mph, and you're in the fast lane - the guy in front moves to the left (in the UK) to the slow lane so you can pass... The Tesla has been following the slower car at 70mph or whatever, but weirdly will slow down to 65 for a few seconds or so whilst the car ahead makes their lane change... in other words, it brakes before it overtakes... I can understand it keeping the same speed, but it seems weird (especially to cars behind you) that it brakes at all...
2) The scariest part is the unnerving phantom braking... I had two events yesterday - one minor one occurred under a bridge, and a more severe one that seemingly had no trigger. This is the single biggest reason as to why driving with AP2 feels different to AP1...
3) It did try and throw me across the road when it saw some tar lines on the road... AP went crazy, wobbled me around like a mad driver and I jumped in to disengage. Why on earth it did this, I have no idea... they really should have some logic in there that just prevents any sudden deviations when driving at speed...
4) It still chooses slightly weird lane positioning - it's fine on a wide open motorway, but on a tighter dual carriageway it will just drift off to the side as it goes around a gentle curve. It must know it's doing it, since it displays the position on the IC. Why not just hardcode it to stick to the middle of the lane as much as possible?!
5) Still too much of a gap between me and the car in front in traffic. I should try it on just TACC and see what the difference is. Presumably Autopilot leaves a large gap so that it can still track the lane lines (which it can't otherwise see if there's a car right in front). To be honest, this is where the blue car in front would be far preferable, but I hardly ever see it on AP2.