Motorcycles are very popular in Rome. The traffic in this city is somewhat chaotic. If you plan to visit this city and rent a car, you will have to drive carefully.
One thing that will surprise you --specially if you are American-- is the quantity and diversity of mini cars. Take a look at the one in the photo --the red one, parked between two bikes. I could see many of these small cars while in Rome, this one being the smallest I saw.
Lets go to take a look at the Fontana di Trevi ...