Circuit de la Sarthe
My process, for those who might be interested:
I took multiple screenshots of the track in Google Earth, composited them together in Photoshop, placed that image in a sketch in SolidWorks and traced out the track, took the parametric data from SW and wrote the .LUA by hand, exported the track sketch as a PDF and imported it back into PS and used it to create the track outline, threw some filters at it, stole some bits and pieces from Der Bayer's "Green Hell", et voila.
UPDATE:
I've added a proper version with the chicanes on the mulsanne straight, also, I fixed a pair of transcription errors at Indianapolis and Arnage corners.