karl gruber wrote:
Why does the 396 in "Automotive" mode sometimes take me off an interstate
off ramp, and then right back on the on ramp?

Perhaps because there was construction of some sort when the data was
collected.

I was amazed when I was on I-85 in Durham NC. The road was in the
process of major overhauling - 2 lanes to 4, etc. It directed me off
and along a section of service road that had not been put in service
yet. The data reflected the way was going to be in a few weeks/months.