Open Trambus 110 by haiamisa
We took the Open Trambus from Rome Termini. Day ticket cost 13 EUR per person. You can hop on and off the bus as much as you like. The problem was that we got late to Rome, it was already past 11.00AM when we boarded the bus, so there was not much time to get on and off as we had to get back to Civitavecchia port/ our ship by evening, so mostly we just admired Rome from the bus. Also there were demonstrations on the streets of Rome that day and the whole area of Colosseum was closed! So there was a change in route (keep in mind that this can happen often in Rome).
It was very hot on the 1st of September and many people on the bus and everywhere. It was very chaotic and not a nice experience.
For the full route and more information see the website below.