Demonstrations one day, traffic jams every day ! On this vast square, car horns sounded by furious drivers rule, as well as backfire from countless vespas, the rumbling of buses, chaotic traffic hubbub (don't try and cross the road unless you feel suicidal !), or ceaseless "prontos" answering shrillish, ringing "telefoninos". Everyone crosses this square. To think that it was a small, quiet square during the Renaissance...