The government decided to limit speed on the Parisian ring road at 70 km / hbut is it really a good idea?
Currently cars are sized to have a minimum consumption (per 100 km) when traveling at a speed between 80 to 90 km / h, limiting the speed to 70 km / h is therefore not a wise choice with regard to consumption energy and therefore urban pollution.
The Strasbourg ring road has been limited in places to 90 or 70 km / h for several years now. We have not (yet) found any studies showing that this had an impact on urban pollution or on traffic congestion…
Another Strasbourg project planned to pass the whole city into Zone 30, it has (fortunately) not been successful because there is a good chance, for the reason mentioned above, that it would have improved neither traffic nor urban pollution.
Debate on forum: limitation to 70 km / h on the Parisian device, a good idea?