Don't want to sound condescending about drivers but on my street I see plenty of people who don't alter their behaviour with the speed bumps - either because th

Don't want to sound condescending about drivers but on my street I see plenty of people who don't alter their behaviour with the speed bumps - either because they are not observant or it's not their vehicle (the council rubbish vans get thrown over them at high speed by their angry careless drivers!)