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20 miles per hour

April 10, 2019, 9am PDT
All of Portland's 3,000 miles of residential streets now have a maximum speed of 20 miles per hour. Similar changes could be coming to more Oregon cities in the future.
The Oregonian
March 23, 2010, 12pm PDT
Over the last decade, London has established more than four hundred 20 mph zones across the city. The 10mph decrease has had a significant effect on the number of fatalities.
Streetsblog