McLaren is road legal la..
There were very few of them though. They were initially race cars
but then converted to road cars.
From wikipedia:
Many F1 GTRs, after the model was retired from racing, were
converted to street use. By adding mufflers, passenger seat
upholstery, adjusting the suspension for more ground clearance for
public streets, and removing the air restrictors, they made quite a
formidable sports car. An F1 GTR Longtail equipped like this can be
described as the ultimate F1, and quite possibly the ultimate
road-going supercar.
Read more at:
http://en.wikipedia.org/wiki/McLaren_F1