Venice was cloaked in fog today, and many transit riders encountered delays as ACTV vaporetti and motoscafi services were cut back or suspended. On at least one water bus, frustrated passengers emerged from the cabin to harangue the crew.
The following video shows ACTV boats operating in the fog on the Grand Canal, with the boat captains using radar to avoid collisions:
Addendum: As the day wore on, the fog got worse. Here's another short video clip, taken from the Calatrava Bridge: