MichelN said:
Does someone know if it possible change the language on guidance road
Unfortunately, S&T is an English software only. There is a french version of S&T Keys 2007 available (free add-on, see link in my signature that is compatible with S&T 2007 only), but there is no way to get guidance text in french language in any version of S&T
But you may add it to the wish list on this forum. Maybe in a future release
Add it in the Streets & Trips Wish List.