Not sure about that. Here's how it plays out: 1) driver coming towards you gets disconnected from her call; 2) she looks at phone to diagnose problem, starts to redial; 3) drifts across center line just before reaching you...

Not to worry, I'm sure it's highly illegal anyway.

It'd likely cause a more dangerous condition as the jammed drivers would be fussing with their phones trying to figure out what happened to their signal.