Route number is 21. Remember it—the number stays the same everywhere: on the stop display, in apps, on the vehicle itself. Look for 21 specifically. If you're not sure you found the right stop, just ask someone nearby: 'Does bus 21 stop here?'

This route serves the Beijing (China) 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.

This route is part of the 'Beijing Public Transport' 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-Su 05:00-23:00. 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.

Yes. Payment rules and discounts can differ by region and vehicle type. If it matters to you, verify current fares and ticket/validation requirements before traveling.

Payment methods: cash, Coins, IC card, WeChat Pay, UnionPay, China T-Union, Alipay. In practice, options can vary depending on how new the vehicle is and what equipment it has. Have a backup payment method just in case, and check the validator or ask the driver when boarding.