Building a vehicle that can handle a busy street, with cyclists, pedestrians, roadworks and emergency vehicles, is a tall order.
You can try to simplify the problem by limiting your routes to major highways and making the vehicle ultra-visible so other drivers give you a wide berth.
But at some point there will be construction, or a car wreck, or debris in the roadway. Eventually you'll need to exit the highway and drive on city streets.
Even if you manage to reduce the hard stuff to 1 mile out of 200, you still need to deal with it.
If you can't handle everything, you're not safe to be on the road.