Head-on collision on 128S in Lexington?

How the heck does a head-on collision occur on 128S in Lexington? It’s a multi-lane divided highway for chrissakes. Right at Exit 31b around 10:25 AM there was a minivan facing oncoming traffic in the left lane with a sedan firmly implanted in its grille. I had the Digital Rebel with me, but I was already too late for work to stop and take photos. Amazingly, no one looked hurt and emergency services hadn’t shown up yet, but I’m still absolutely dumbfounded as to how the minivan ended up backwards in the left lane. Guh.