The statistics around accidents with large vehicles like that are less about their operation and more that they exist at all. Accidents will always happen, certification or no. The issue is someone struck by one will be more likely to sustain heavier or critical injuries, and smaller cars offer less protection for their passengers when hit by heavier vehicles.

So rather than “you can use one of these completely unnecessary vehicles if you pass a test once”, they should just be outlawing them all together as basic consumer vehicles. If they aren’t being designed for specific utilities or business purposes, you can’t make them and sell them to just anyone.