@DNiculescu

Meaning that according to the map, the section is one-way traffic.

It is not uncommon for traffic directions in reality not to be up to date on the map or vice versa.

The phone is used as backup : no WiFi NO SIM !
As long as the GPS feature in the device works properly, it is always possible to perform a backup offline simulation in "flight mode" (without WiFi of course) and/or also without a SIM.