Blue car on the south at a stop sign and green car eastbound approaching with no stop sign:
a-blue car should get off the cell phone and wait until green car passes though and then proceed when the intersection is clear
b-blue car should go ahead and turn because there is no time like the present
c-blue car should honk the horn and wave hand frantically indicating that the green car is going too slow (by obeying the speed limit)
Not all blue cars are always on the phone, some are messing with other things too.