The original had a top speed of 40 mph and its only security feature was prayers.
It worked: https://www.youtube.com/watch?v=gLOI5rPVols
Ahem. Having driven a 2CV, that top speed literally only applies to the first revision. (So, yes, technically "the original")
Later versions could do 65mph. 75mph downhill with the wind at your back.
I have done at least 70mph with a friend's 2CV on the Autobahn downhill. Doing 170 with a Porsche felt way safer.