It probably wasn't. I bet there was a quarter of the traffic on the road.
There are so many people who jump on speed as being a killer. It like a loaded gun. On its own it's harmless. Throw a d*ckhead into the mix and that's when people start getting hurt.
I remember My dad telling me about when he used to work for Marcos cars and was driving the van down the M4 when a Ford GT40, in full race livery complete with flames shooting out of the pipes, passed him so fast it shook the van.
Maybe it was a 3l Granada?