This happened in Stenungsund the night before last
During the day, this road is one of the busiest in all of Sweden. The speed limit is almost certainly over 100 kilometres an hour. I imagine that the restaurant in the picture is open from before lunchtime to late at night, and has all sorts of people frequenting it.
When we're in Bohuslän, we often drive past a couple of kilometres west of this spot.
Edit: No one was severely hurt, as I understand it.