an image of a large utility vehicle on the golden gate bridge. it is functionally a giant, two-ended truck that operates as a zipper for the articulated median barrier, allowing the bridge's operators to swap it from one side of the middle lane to the other.
https://cdn.masto.host/godforsakenwebsite/media_attachments/files/113/041/163/854/236/249/original/f2c3c09c605d2562.jpg