Blue car is westbound talking/texting on the cell phone and hovering over the yellow line when the black car appears eastbound:
a-blue car should cradle the phone with her shoulder in order to keep talking and stand her ground on the yellow line
b-driver of the blue car should put down the cell phone and get back in her own lane
c-the driver should not change phone habits and should cross further into the oncoming traffic lane and force the black car out of the lane (often resulting in being in the shoulder) (part “c” was only coincidentally labeled “c”)
Well that explains it, if it is a blue car driven by a she then there would most likely be a cell phone in use, She should pull over to complete the call/text.