According to a report, after lowering the speed limit by 10 km/h, Edmonton saw 25.1 per cent fewer collisions and 31 per cent fewer injuries and fatalities throughout the city.
I find that I have more time to react to pedestrian's or avoid collisions when I'm doing 30-40 km/h in a playground, school or residential area. The only problem is most times drivers behind me are inpatient. They honk or try to overtake. Classic Edmonton drivers.