I could not agree more about your comments relating to speed cushions. I live in a conservation area festooned with humps and cushions due to an infant school a few doors away. I drive a small Mini and have to slow to almost standing to cross them. Some are large and badly maintained, yet I’ve noticed that lorries, vans and 4x4s (the largest and most dangerous of vehicles) can cross them without slowing. My whole house shakes every morning at 6am as trucks from a nearby builders merchant race down our street at high speeds and launch themselves off the speed cushions, creating earth tremors when they land. The law of unintended consequences has made our road even more dangerous for the small children thanks to the uncontrolled speeds these large vehicles can attain due to these ill-conceived obstructions.