That is, a grouping of a number of elements in the timeline that constitute an entire trip, typically starting and ending at "home".
Having this grouping would allow for example to expand/collapse this in the timeline for past/distant future elements to focus on the current trip. Also, you'd probably want to see the aggregated informational elements (country incompatibilities, weather forecast) at the beginning of a trip, when packing.
Can we auto-detect trips? Do we need manual grouping of elements to trips?