Car mode starts and stops recording when it detects motion. I don't know if it's always that way or if you have to somehow activate it? Maybe it's in the settings file.

The mobius seems to record either 5 or 15 min. clips (I think 5) and it repeats that last few frames of the previous clip at the beginning of the next one to ensure you don't lose anything. I imagine there's some light editing required if you want to put together a longer, uninterrupted file.

I'm basing this off a few reviews and watching some youtube stuff about it - I could be mistaken.