How is a split frame and folding tricycle for adults different?
A split frame tricycle isn't a folding tricycle in the traditional sense. The frame doesn't collapse or fold flat. Instead, the front section detaches cleanly from the rear: the front fork, front wheel, and handlebar come away as one unit, leaving a significantly more compact bike that's much easier to lift, manoeuvre, and fit into a car boot.
Reattaching the two sections is straightforward and doesn't require any tools. The connection is secure and stable, so there's no compromise on the ride itself.