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These wide and relatively shallow speed humps or cushions can slow traffic and keep drivers from gaining too much speed on residential streets
Intersections like this with "bulb out" corners slow traffic and shorten the length of cross walks, making them safer. Crosswalks are also boldly painted with wide white stripes, and the yellow poles draw extra attention for drivers.
Small roundabouts like these at 4-way intersections force drivers to slow down to maneuver around the center island.
Just having clearly marked lanes on residential streets can vastly improve speed. When there are no lanes, cars have the full width of the street, making it easier to drive fast.