current
Where the vehicle is, as a place name, updated while it travels.
Read through the movement seam's ksl.modeling.spatial.VehicleMovementIfc.positionNow rather than from anything written on arrival, and the difference matters more than it looks. A location written when a vehicle is placed and when it arrives still reports where the vehicle set off from throughout a journey. Anything asking a moving vehicle where it is -- a bidding rule, a re-tasking rule, a feasible-set cost -- would be answered with its last stopping place, and would keep choosing as though it had never left.
How finely "while it travels" is resolved is the substrate's business. A guide path answers with the junction a vehicle is heading for, which is the right approximation where a vehicle cannot turn round: the junction ahead is the first point from which it has any choice. An interpolated substrate answers with the interpolated point. A substrate that cannot say answers with the place it set out from, and says so by not interpolating.