Why must you not drive extra slowly for no good reason?

Driving unnecessarily slowly can disrupt the normal flow of traffic, causing delays for other road users (point 1). It also increases the risk of rear-end collisions because drivers behind may not anticipate sudden speed reductions or may follow too closely (point 2). Furthermore, when drivers are stuck behind very slow vehicles, they may attempt risky overtaking maneuvers to pass, which raises the danger of accidents (point 3). German traffic rules emphasize driving at a speed that is appropriate and does not hinder or endanger others, promoting safety and smooth traffic movement.