Couple quick clarifications please on Metro Tickets:
a BIT ticket says good for 75 minutes.... does this mean if I can ride one way on the metro and use the same ticket to ride back the opposite way a half hour later (as long as it is all completed within 75 minutes).... or is it good for 75 minutes, but one way only?
a BIG One day Tickets says good for 24 hours on one website I looked at, but then says expires at midnight on the day validated..... If I use it at 9am in the morning....does it expire at midnight the same day or is it good until 9am the next morning (24 hours)?
Finally, I haven't been in Rome in 8 years, and I remember having to buy the tickets at one machine...and then validating it at another....I think I read somewhere that you validate at a "yellow" machine...can someone clarify this for me? Last time I remember just watching everyone in front of me...but I am getting old and its been a while I don't remeber exactly what we did