It's plain old pattern recognition. I live close-ish to where Tony Luzio (he has a thread on here if you feel like searching) was found in a retention pond in his car, almost ten years after going missing. This case actually reminds me of Tony A LOT as it's thought that Tony missed a turn in the dark, which I'm guessing is similar to what happened here. There have been several similar cases on here but I don't recall names atm. I really, really would have preferred to be wrong, I must say

ETA: I also live in a college town and we had a really sad case a few years back, where a pair of students were speeding, flipped and landed in a creek very similar to this one, with a similar outcome. Watching speed in the dark and in inclement weather is SO important.