Stockholm's cordon charge cut cordon-crossing traffic by roughly 20% from 2006; the reduction has held for over fifteen years and, once external factors are controlled for, has if anything strengthened slightly over time.

Evidence (1)

After a trial and referendum the ~20% traffic reduction held constant since 2007; removing the charge during the trial gap returned congestion to near baseline.

https://toolsofchange.com/en/case-studies/detail/670/

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