A dozen of years ago, late at night, when dropping my girl friend off at her home, I saw similar closure. No advance warning, around a little bit of a curve, around 11 pm or so. Cars coming to an abrupt stop, making quick lane changes to avoid collisions and a few close call rear end collisions. I keep plenty of space, from the car in front of me so, I was prepared for the sudden stop.. When I returned 1/2 hr later going the other directions, I could see cars in that same area were not so lucky.