It's already part of highway code that people drive at appropriate speed regardless of the limit - so if a residential road is narrow and full of parked cars do you NEED a law to say slow down to 10? telling a child or a dog to "look where they are bloody going" isn't going to have too much effect is it look, my point is you can tell EVERYONE as much as you want to pay attention, but as the one driving the car, I'm the one responsible (probably, mostly) for hitting something, anything that's on the road. It would help me as a driver if I could be sure the roads were clear of idiots, but I can't be sure - so mentally shrugging and saying well it won't be my fault, or I can't be expected to see them is just lazy thinking