Route number is L21. Remember it—the number stays the same everywhere: on the stop display, in apps, on the vehicle itself. Look for L21 specifically. If you're not sure you found the right stop, just ask someone nearby: 'Does bus L21 stop here?'

This route serves the Asturias (Spain) 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 EMTUSA. 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.

On transit maps this route is marked in red. 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.