Info from Tirol Tourist Board: "Unfortunately this part of the Arlbergstraße is banned for bicycles from 24th April until 6th October 2023 due to the closing of the Arlberg Road Tunnel in that time. The only other way is via the Arlberg Pass.
 
Due to the expected additional traffic volume during the peak travel season, there is that ban on cycling on the B 197/L 197 between Langen station or St. Anton (Mooserkreuz) to the top of the pass in St. Christoph."