The Federal Council has tightened the rules for imposing 30 km/h zones on city streets, requiring cantons to prove that a slowdown will not push traffic into residential neighbourhoods
Cities like Lausanne, which has embraced 30 km/h on major routes, will now need an assessment showing the limits don't create commuter rat runs.
The change was broadly backed in consultation and takes effect from 1 October. It marks a federal check on the pace at which cities have been lowering speed limits.
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