Definition of pedal for English Language Learners. : 1  a flat piece of metal, rubber, etc., that you push with your foot to make a machine move, work, or stop. : 2  a lever on a piano, organ, etc., that you push with your foot to make or change a sound.
In Rome, the capital of Italy, they speak Italian. actually Rome was founded in the 700 B.C.'s so Italian wasn't a language Romans spoke all Latin.
In Rome, obviously, the population speaks Italian and the road signs are mostly in that language (except for STOP). If you are staying in the city, there are plenty of English alternatives to be found; Rome is a popular place to visit and there are maps and information in many languages available.