Pedestrian safety is improved very very dramatically by cutting speed limits on urban streets to 25 or even 20 mph.<p>A pedestrian hit at 20 mph is likely to sustain minor injuries. A pedestrian hit at 40 mph almost always dies.<p>Drivers also have much better road awareness and much more time to react at 20 mph, and pedestrians likewise have a better chance of jumping out of the way of a slower-moving car.<p>One good street design idea is narrowing traffic lanes. This makes drivers slower and more careful, but doesn’t cause any increase in accidents, and doesn’t substantially reduce car throughput. It also provides extra space that can be used for bike lanes, sidewalks, and better designed intersections.