Brutally Honest Prices, Routes & Insider Hacks Why This Guide Matters Four different companies City Sightseeing (red buses), Big Bus (burgundy), I Love Rome / Gray Line (pink), and Green Line Tours (green) —circle Rome every 10‑25 minutes. They all promise the same thing: Colosseum views from an open‑top deck and the freedom to “hop off” whenever inspiration strikes. What they don’t advertise: Via dei Fori Imperiali is often closed for events, forcing detours that skip the Fo