Two-way traffic
Warning signsSign no. 1.26OSR art. 13
What the sign says
The road returns to two-way running where traffic had been separated: motorway exit, end of a one-way street, roadworks. The left lane is no longer yours.
The exam trap
It is the motorway-roadworks sign: oncoming traffic is switched onto your side, and the reflex to pass on the left becomes driving into it.
Study topic
Overtaking and passing
The signs are the official depictions by the Federal Roads Office, from the annexes of the Signalling Ordinance (SR 741.21): official works, unprotected under Art. 5 of the Copyright Act. The explanations, by contrast, are written from federal law — never taken from a third-party catalogue.