The line is identified as 4. You can find this designation on metro maps, signs in passageways, platform information boards, and transport apps. Before boarding, always check not only the line number or colour, but also the final destination of the train — this will help you avoid boarding a service heading in the wrong direction.

This metro line runs through Qingdao (China). Metro lines typically connect several parts of the city — from residential neighbourhoods to business districts and the city centre. To find out whether this line suits your journey, open the metro map and check the station locations relative to your destination. Sometimes one transfer is more convenient than searching for a direct route.

On metro maps, this line is shown in #007A33. Colour coding is the primary navigation aid in metro systems — it helps you quickly identify the right direction on signs, maps, and information boards. When making transfers, always pay attention to the line colour to avoid confusing platforms or directions.