Maura Murray disappeared 20 years ago under similar circumstances (single car accident, gathered some times, and walked away from the car) and hasn't been found.
I feel like there must be some...innate survival instinct after a crash like this? Triggers the survival/flight instinct. Another man, Christopher Bartell, was missing after he crashed his car in Liberty, TX in 2021. Luckily, he was found alive about 48 hours later. (
article) However, I don't know offhand how far he got from the crash site.