A lot of programming is thought. In fact a programmer is worthless if he can't come up with his own theory.

Have you got to the point of getting the AI to pick up passangers? After this point you can tell it to ignore passangers if the player is so close and driving at a slow speed. If it's ignroing that passanger it should go back to it's "search for passanger" function.

If you're not this far, you need to worry about this later.