Or, hear me out, add some nozzles that require very high pressure to activate that shoot flames at the thing trying to crash into you to scare it off or burn it up before it has a chance to get through the door. Then accidents will have to think twice–maybe even three times–before they pop up out of nowhere while you’re doing normal everyday things like sneaking through a red light (if you roll slowly enough, you can try to argue that you were pretty much stopped the whole time. It’s not a crime, it’s a great way to save time.)