If u has already updated the game to patch 1.30, here is the temporary fix for Truck Traffic Pack by Jazzycat v2.8
Note that the fix must have higher priority than pack.
Compatibility: ETS2 v1.30
How to install mod for ETS 2:
- Download this mod.
- Extract it!
- Paste the .scs file(s) into your My Documents/Euro Truck Simulator 2/mod folder.
- Run game ~> Mod Manager ~> Enable mod.