There are about 40 traffic deaths per year in Amsterdam. Someone else commented here that when hit by a car at 50 kph, there's a 20% chance of survival, and at

There are about 40 traffic deaths per year in Amsterdam. Someone else commented here that when hit by a car at 50 kph, there's a 20% chance of survival, and at 30%, there's a 90% chance of survival. So in the best case, this might save 35 lives per year. Not to mention the reduction in noise, pollution, and damage to vehicles. I think that's easily worth it.