Some drivers are now taking matters into their own hands, signing up for lessons in Thai kick boxing and even Krav Maga, a martial arts fighting style developed by the Israeli armed forces, which is a combination of boxing, aikido, judo and karate.
"I'm not teaching them to start a fight. We tell all our students that they should only react if they are attacked," Ennio Della Bianca, 50, a Muay Thai boxing instructor, told Il Messaggero newspaper.
"But we offer a course that gives them all the means, if necessary, to defend themselves," he added.
Drivers on Rome's underground trains are also taking part in the training programme.
"We are less exposed than bus drivers, because we sit in closed cabins, but there are still risks," one driver said.