I just read this on the BBC
The effects of overtourism across Italy
Starting this June, tour groups in Venice will be capped at 25 people per group, officials announced in December. And tour leaders will no longer be allowed to use loudspeakers to communicate with their flocks as this "can generate confusion and disturbances". The devices will be banned in the city and on nearby islands, officials said in a statement. And, as part of the new rules, tourists are also asked to no longer pause while traversing the city's bridges.