This is true but personally I would rather see this shift to something closer to +10%. Going 35 in a 25 mph residential zone puts anyone not in a car in signifi

This is true but personally I would rather see this shift to something closer to +10%. Going 35 in a 25 mph residential zone puts anyone not in a car in significant danger. Going 27 or 28 doesn't change the risk nearly as much. This rule of thumb still allows for 61 mph on urban freeways and 77 to 83 on rural interstates.