Many years ago, there were something like 9 teenagers that went missing, and all of a sudden, their van was found in a van submerged in a retention lake in Florida. Their car had driven off the road. They are very hard to see at night if you don't know the area. There are also 3 men from RI that went to Florida for a fishing trip who also disappeared in a similar fashion, and they have never been found. Having been in Florida several times, I can see how it is possible.
"hard to see at night if you don't know the area".