Q: I’ve noticed some cities changing their speed limits in neighborhoods and business districts from 25 MPH to 20 MPH. Does five miles per hour really matter for safety or is it just another way to discourage driving?
A: There is little doubt that some city planners would like less people driving cars on city streets. And not just city planners; when I drive through Seattle I often selfishly wish that less drivers were allowed on the road (as long as I’m still allowed, of course.) New roads are expensive and there isn’t always room for them; in crowded cities fewer drivers might be the best (even if unrealistic) option. However, I don’t think a reduction from 25 MPH to 20 MPH is part of that agenda. The data show that a five MPH speed reduction really does have an effect on pedestrian safety. Continue reading “Is Twenty the New Twenty-Five?”