I just saw what looked like a normal bicycle drive around the a block a few times without a rider. There was a clear plastic box with some electronics, a motor on the back wheel and something connected to the handlebars (presumably some servo mechanism), and a person briskly walking next to it with some gizmo in their hand, but at a few paces distant and not touching it.
It could turn a fairly sharp corner at speed, with a radius of perhaps 3 meters.
There were some packs that could be weights and/or batteries near the seat as well.
Is this unusual or particularly challenging or a just-recently-solved engineering challenge, or is this well known and oft-repeated feat?