Someone has to put a chart near it, describing the decline in driving in the city. When you're limited to 30kmh, you might as well get a scooter...
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When getting on a larger road with less twists and turns, the speed is higher and the gains of the speed is higher; but the danger is also lower. Any road that may stop to wait for a turn or red light, could probably be capped to 30km/h without much cost to your precious commute time.
So let's say 10km (might be a bit more) in city traffic. 12 minutes of my commute each way [EDIT: impacted by speed limit, not counting lights, corners etc.] Total 24 minutes. That would turn into 20 minutes each way, total 40 minutes. Huge difference.
Most of this "city" driving is in streets that are plenty wide (sometimes 3 lanes each way with a separation between directions) and have minimal to no pedestrian traffic. On the smaller streets you're probably not doing 50 anyways even if that's the limit since it will feel too fast.
Vancouver has been looking at reducing speed in the city to 30km/hr. It's hard to say if it will reduce traffic deaths (maybe?) but it's going to have some pretty negative economic effects IMO. Some of the smaller streets are 30 anyways. There are probably smarter solutions but city and road planners don't seem to be able to find them.
I'm willing to bet Helsinki is denser and has much better transit.
Three lanes either way i consider a real motorway. I don't think I've seen a much larger road in Sweden or Finland myself. These roads would clearly not be capped to 30km/h like discussed in this article. (more likely I've seen is 80-90km/h near the city with a lot of merging traffic, and 100-120 outside).
I think the easiest way to visualize what kind of city it is, is to consider that any road with red-light, walkway/bikeway by the side, roundabouts, or without side-barried or trench to be a "city road" and capped at 30km/h. Which is not unreasonable, and unlikely to affect commute by much, as you generally navigate to the nearest larger road, travel by that, and then merge back into the city. (and this is most roads in the city by distance or area)
as a European looking at an american city, they feel like playing sim-city but not finding the "small road" option. And slapping red-lights, stores, and crossings om roads that no human should be near.
Speed limit 50km/h ... It has lights and intersections. Almost no pedestrians.
Vancouver has many wide multi-lane streets. Some in denser areas with more pedestrian traffic some less. It has almost no real highways going to the city.