But you control that by setting expectations, like driver must take a reasonably direct route after accepting request or arrive within a reasonable time. It is

But you control that by setting expectations, like driver must take a reasonably direct route after accepting request or arrive within a reasonable time. It is up to the driver then to decide if new request is on the route or postpone accepting until first commission is handled (somebody else might pick up that ride then). I'm sure the devil is in detail though and we might end up with drivers occupied by route juggling when they should focus on safely driving...