This might be useful:
Hello Anton!
I would ask your help, how google is needed maps traffic layer to display?
Thank you for the help.
I don't think it's possible at the moment. Do you have Google Maps license by the way?
Hello!
Thank you for your fast answer, is license yes.
I would like to express my thanks the traccar for a server, very useful help my work.
could you help me? I would like to know how I can add a new layer map to different server that already brings traccar