I’d wager the poor soul was futzing around with a phone.
A good possibility. Yet lots of folks think it's no big deal to use a cellphone while driving.
"The female minivan in front of me said she (the Saturn driver) swerved into our lane (on a 2-lane rural highway), corrected in time to miss her, but over-corrected and came back into our lane... narrowly missing her, but hitting me dead on."