Median

While waiting for the bus at the evergreen point park & ride the other day, I couldn't stop looking at the striped section of median and wondering what purpose it serves. You can see daylight under it, and you can see lynch pins at both ends so it is obviously movable, but how does that help anything? If they were closing down the 520 bridge, you would want to stop traffic about half a mile back at the last exit. Except that there is another on ramp later. But they could block that on ramp off too. Maybe blocking the lanes just before the bridge is easier than blocking them earlier or in multiple places. And I guess if there is an opening in the median, cars can turn around there. I guess I've worked it all out now. Thanks for playing along at home.