Different cars have different systems, but mine has never triggered for a car coming into my lane. Sometimes it's triggered on cars leaving the lane while slowing though.
Otoh, I won't use the adaptive cruise control, because the granularity for following distance settings is too coarse, so I have to pick either follow closer than I'd like or follow far enough back that people treat it as an engraved invitation.
I'm not a big user of cruise control anyway, so no big deal. I'm also less frequently driving long distances on I-5, so not in that situation much anyway.
Otoh, I won't use the adaptive cruise control, because the granularity for following distance settings is too coarse, so I have to pick either follow closer than I'd like or follow far enough back that people treat it as an engraved invitation.
I'm not a big user of cruise control anyway, so no big deal. I'm also less frequently driving long distances on I-5, so not in that situation much anyway.