Forza Motorsport 4, the Casual, and the Hardcore - Xbox 360 Preview at IGN

Top Gear's involvement goes beyond presentation.
While the announcement last year that the automotive authorities at Top Gear would be assisting Turn 10 in making Forza Motorsport 4 an even more authentic game, the leaked trailer indicates that more than the show's branding is carrying over. Trailer footage shows a track that is suspiciously similar to the Top Gear test track, and other famous racing destinations covered on Top Gear, such as Transfagarasan Road in Romania, are visible in the video as well. The Top Gear license has added a more world-spanning flare to Forza.
Transfagarasan