Car wrecks

Less than an hour ago there was a wreck on my street corner. Both of them were okay but it brought up a question I’ve wondered about before. One of the cars was left in the middle of the street until police arrived. Now should you leave the car where it is until police arrive or (assuming that it’s still drivable) do you move it out of the way to prevent further accidents?

Here we’ve got signs all over the place telling you that the law requires you to move it out of the way if it’s operable.