In Saint-Brieuc, 98% of the streets went to 30 km / h this Thursday, June 30. This municipality of 45,000 inhabitants therefore follows in the footsteps of large cities such as Paris, Bordeaux, Nantes or even Lille. Clamart and Clichy were the first towns with at least 45,000 inhabitants to lower their speed in 2008.
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For the municipality of Saint-Brieuc, this should make it possible to have “a peaceful, walkable, cycling and breathable city. A reduction of 20 km/h in the speed of road users makes it possible to halve the noise (around -3 decibels) near traffic lanes. […] Vehicle speed also has a direct impact on the frequency and severity of accidents.is it written on the city’s website.
In Grenoble, a “test” metropolis, already perceptible benefits
In 2016, Grenoble was the first French metropolis to limit its speed to 30 km/h. According an initial assessment carried out by the Center for Studies and expertise on risks, the environment, mobility and planning (Cerema) in 2020, reducing speed is already having positive effects on the quality of life of residents.
The Cerema report concludes in particular that “a favorable evolution of the accident rate”. “We note in particular a reduction in the number of accidents and victims recorded annually, a reduction in the proportion of victims killed or injured hospitalized in favor of injured victims not hospitalized, i.e. an overall improvement in the seriousness of the accidents recorded.it is specified.
This study also reports a positive impact on the sound environment in Grenoble with “a decrease in vehicle noise ranging from 1.4 to 3 dB”. Regarding pollutionCerema estimates that a “lowering the speeds practiced from 50 to 30 km/h would favor the emissions of pollutants from the exhaust of motorized vehicles but a fluidification of motorized traffic on the perimeter concerned would favor [en revanche] a reduction in these emissions, as does the reduction in the volume of motorized traffic”. In the case of Grenoble, a decrease in motorized traffic was indeed noted between 2016 and 2018 (-9% of light vehicles and – 20% of heavy goods vehicles).
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