Helsinki records zero traffic deaths for full year

"More than half of Helsinki’s streets now have speed limits of 30 km/h."

This is the only secret.

People over speeding is what kills.

The real reason is Finnish absolutely draconian fines that scale up with income and really really strict enforcement. Make fines start with $500 and go to thousands and actually enforce them and not what SF is doing and we'll have the same but people over here don't like to hear it...

I'm not sure about the enforcement part. In Finland we have one of the lowest amounts of policemen per capita, traffic police seriously lacks resources. Moderate speeding is pretty common due to that, despite the fines. Maybe it's better in Helsinki than other cities or the countryside, I don't know.

I regularly drive about 300km trips without seeing a single police car, only one static traffic camera on the way.