With any doubt, the viability of Venice is pretty original, compared to that of any other city. Since it has canals instead of the usual roads, it is subject to its own traffic laws.
First of all to go throught the canals, by boat, it is necessary to keep the left side and go ahead with a cruising speed of 5km / h, 7 km / h in the Grand Canal, 14/20 km / h in some open areas, such as between Venice and the island of Sant’Erasmo. Speed is indicated by appropriate signs, square-shaped with red frame and a black number in the middle.
Then there are the one-way streets, canals forbidden to motor vehicles and exclusively reserved to the gondolas; canals too narrow to be crossed.
Limits are marked in an unmistakable way, with the famous blue square-shaped sign, with a white gondola in the middle.
Motor boats, however, must always go ahead in the central part of the canal, holding each, in case of intersection between two crafts, their own right side.
In the Grand Canal may run even rowing boats, and they are the only ones which can go ahead both right and left, to facilitate the best rowing conditions, depending on weather and and tide.
A funny curiosity: drivers of rowing boats must say aloud, next to an intersection, what they want to do.
You can hear them shout “a stagando” if they intend to pull over to the right,
“a premando” if they wish to pull over to the left,
and “de longo ” if they intend to go straight.
You have just to hang around to discover the true face of Venice, where everything was designed to be seen from the water.