The Sat Nav in my 11 reg C-Max has a system where it warns you of traffic problems - very good when I was on the A17 recently - however in and around Peterborough it is constantly warning about A15 narrow lanes - there aren't any, and a fair bit of the A15s (there are 2 A15 routes) are dual carrieageway. I don't want to turn off what could be a usefull tool, but I do want to stop the very annoying A15 messages. Any one any clues/ideas?

Thanks

Trevor