The traffic sign "Directional indication by arrows" (1000-12) is used to guide drivers on the direction of traffic flow. This sign typically consists of one or more arrows pointing in the direction that vehicles are permitted or required to travel.

In Germany, these arrows help indicate lanes for various types of movement such as turning left, right, or going straight ahead. They can also show specific routes for different types of vehicles or may indicate the way to follow in a roundabout.

It's important for drivers to pay attention to these arrows since they provide critical information on how to navigate the roadway safely and in accordance with traffic rules. Failure to comply with the directions provided by these arrows can lead to violations and accidents. Always ensure you're in the correct lane before reaching intersections or turns as indicated by the sign.