Guide rollers keep the draw span pontoons on course when they are
being retracted to create an open channel for marine vessels and
extended to open the roadway to drivers.
IM1~USN~RET and zargoman added this video to their favorites.
Washington State Dept of...
Member since 2007
Here's a link to this video. Just copy and paste!
show short URL
Copy and paste the code below:
Customize the video player
Some rights reserved