Here is a film showing what traffic was like in Paris in the 1950s, ‘60s and ’70s. It’s a pleasantly nostalgic way to spend 19 minutes as you spot a variety of classic Citroëns in a truly french real world environment.
The title of the Paris Archives INA film is “Les embouteillages dans Paris ne datent pas d’aujourd’hui” (meaning; Traffic jams in Paris are not new).
The comparison with traffic in Tokyo is enlightening. And check out how they regulated Paris traffic flow (or rather — lack thereof).