I always thought TJA was essentially the act of activating both LKA and ACC when traveling at slower speed. At least, that's how I use it and it seems to work well for me.
About to leave the office and sit in traffic - I may try just the LKA button but then I think I'd still need to work the pedals on my own. When I activate both buttons, I can be both hands and feet off for quite some time.
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