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Comment by levocardia

2 days ago

I think you also have to enforce it. Helsinki also has many automatic speeding cameras. I doubt just putting up a 20 mph speed limit sign would make a big difference without more enforcement.

Speed sensors that turn the traffic light red for 10 seconds are also quite effective without making the place dystopian with CCTVs and fines. I've seen it in Portugal. At the other end is Austria, which uses cameras and fines.

Maybe not but people tend to not go more than 5-10mph over unless they’re on the interstate/highway. If it leads to overall significantly slower traffic it’s worthwhile.