Route number is 021. Remember it—the number stays the same everywhere: on the stop display, in apps, on the vehicle itself. Look for 021 specifically. If you're not sure you found the right stop, just ask someone nearby: 'Does bus 021 stop here?'

This route serves the Rome (Italy) region. In larger metro areas, routes can pass through several districts or towns. To know for sure if it works for you, pull up the route map and check the key stops and direction.

Operator is ATAC. This is the official company responsible for the route. If you run into problems (rude driver, breakdown, dirty vehicle, delays)—contact them. It helps to note the time, direction, and route number—makes your complaint more specific and gets handled faster. Contact info is usually on the company website or in transit apps.

This route is part of the 'ATAC' transit system. Within one network, payment and transfer rules are often consistent. Terms can differ though, so check current fares and payment methods in up-to-date sources before your trip.

Operating hours: Mo-Sa; PH off. First and last trips can differ by day of week and season. For late-night travel, check current arrival predictions and have a backup plan in case the schedule changes.

On transit maps this route is marked in #0c69bf. Color helps you spot the line quickly and tell it apart from others. In some cities the line color appears on stop signs or even on the vehicles themselves. The exact shade might vary between sources—go by route number and endpoints instead.