Do you know what this big, blue vehicle is?
If you're familiar with Coronado you've seen it plenty of times. It's one of two "zippers" which move the Coronado Bridge's median divider twice a day to accommodate the surge of traffic coming on the island in the morning, and leaving in the afternoon. The two vehicles move the divider segments piece by piece, much like zippers on clothing. It's a clever solution that allows this five lane bridge to swap the center lane to either side as needed.