You can find all the informations about cross-border fares, here (only in german).
Tram line 3
The half-fare travelcard, as well as day tickets valid Switzerland-wide and TNW day tickets are not valid on tram line 3 between the border and Saint-Louis. The GA and the U-Abo is valid on the whole of route 3. You can find more information about this here (only in german).
Tram line 8
The GA as well as day tickets valid Switzerland-wide and TNW day tickets are not valid on tram line 8 between the border and Weil am Rhein Bahnhof/Zentrum. The U-Abo is valid on the whole of route 8. You can find more information about this, here (only in german).
Bus route 38
The GA as well as day tickets valid Switzerland-wide and TNW day tickets are not valid on bus line 38 between the border and Grenzach Wyhlen Siedlung.
Bus route 55
The GA as well as day tickets valid Switzerland-wide and TNW day tickets are not valid on bus line 55 between the border and Kandern. The U-Abo is valid in the RVL-zones 1, 2 and 3 on bus line 55.
