As someone who lives and regularly drives in Helsinki, I feel that most kilometers I drive are on roads that allow 80km/h. The 30km/h limits are mostly in residential areas, close to schools and the city center (where traffic is the limiting factor and it's better to take the public transit).
So while 30km/h might be the limit for most of the roads, you mostly run into those only in the beginnings and ends of trips.
So while 30km/h might be the limit for most of the roads, you mostly run into those only in the beginnings and ends of trips.