"accept that we have any right to be on the road"

Didn't your mother teach you to keep your toys in the yard...   Bike paths are absolutely the way to go, cause they have NO business being on the street with motor-vehicles... or on the sidewalk with pedestrians...

When Ralph Nader was pushing for the seat-belt as mandatory gear in every car, he also invented (IIRC) a key pad system to help deter unsafe and infirm drivers... Like the old hand held game "Einstein" a key pad in the dash, when you tried to start the car would 'play' a sequence of a handful of numbers.... If you wanted your car to start, you had to play it back exactly as it was presented to you... (You may have been given 2 tries) Once you failed, your cars ignition would lock-itself-out for a certain time period. This would cut way down on the number of drunks/stoned/emotionally excited (Don't drive angry) or infirm people on the road.