I think you underestimate how many novelties the car will encounter on existing routes and how adept these cars are at navigating novel routes. I imagine this

I think you underestimate how many novelties the car will encounter on existing routes and how adept these cars are at navigating novel routes. I imagine this route data is an extra extra safeguard which allows them to quantify/measure the risk to an extent and also speed up journey's/reduce level of interventions.