Why it matters: Keeping right, road narrowing (F5/F6) and obstacles

These rules prevent exactly the kind of misunderstanding that leads to a head-on situation at a narrow bridge or an obstacle: if both drivers assume the OTHER one will stop, they both keep driving. The F5/F6 colours and the half-of-the-road rule for obstacles give one unambiguous answer to 'who stops here' — no negotiation needed in the moment itself.