A Random...Yet Plaguing...Question for the Universe.

What is it about elderly drivers in ginormous old cars the color of sun-baked putty, and the inability to drive in one lane or the other!?! Nooooooooo....they straddle the middle of the road, steering their barges S...L...O...W...L...Y down the road, creeping up to every corner to accelerate to the next.  And I am ALWAYS the person caught behind them!