> you suddenly had to swerve right then left then right at highway speed

Surely you didn't "have to". Didn't it occur to anyone that slowing down might make it less dangerous?

Here's some pictures to help understand what this thing was:

Aerial: https://i.redd.it/cyol33goebfy.jpg Street view: https://imgur.com/a/mDH0H Artist's impression of operation: https://i.imgur.com/nIeXbXt.png

(Found in the reddit thread https://www.reddit.com/r/Seattle/comments/5ticw5/til_a_dange...)