Originally Posted by
350htrr
..., I wave, meaning as she passes me that everything is OK... The driver keeps going,...
I did a bike trip in Europe, fully supported, tour group provided a guide that rode with us and a van to haul the luggage. They told us if we wanted the van to stop, pat our hand on top of our helmet, that was the signal that you would otherwise never use so it could not be mis-interpreted. Then they would stop at a safe location to do so.
Makes sense to have a signal that can't be taken the wrong way.