This means that at some point in the trip certain driver itineraries may differ from pick up locations to drop off locations that others are not going to but will meet up later at some point in the trip.
Normally at the beginning of a trip all drivers will be together and then separate into different routes and meet up again by the chase driver who will pick them up. You will not see the other drivers specific itinerary but the chase driver will have access to everyones routes.