The best way to get to the Rock am Ring site in Mendig is by the shuttle buses that run from Koblenz.
A regular bus service is operated from Koblenz to Mendig by RMV Rhein-Mosel Public Bus company. In 2016 the buses run from the Wednesday before Rock am Ring on the 1st June 2016.
Services start from before Koblenz and Andernach to the festival site.
From Thursday 2nd June 2016 there is also services from Plaidt and Ochtendung available and on the Friday there is a night bus available also.
The rock am ring shuttle bus numbers are as follows:
Line 345: Shuttle Koblenz – Mendig und zurück
Line 9345: Shuttle Andernach – Ochtendung – Plaidt und zurück
Tickets for the SHuttle bus can be purchased crom the Customer Service Center in Koblne. The rock am ring shuttle bus service runs to the west entrance of the festival site.
Full Details can be found on the DN Bus Company website