Nonsense. No one using public shadow and safety driving will get close to L4. And will kill thousands needlessly when they start training accident scenarios. The solution is to switch 99.9% of that to aerospace/DoD simulation technology. (Not gaming architecture based systems since they have significant real-time, model fidelity and scaling/loading issues).
SAE Autonomous Vehicle Engineering Magazine-End Public Shadow Driving
Common Misconceptions about Aerospace/DoD/FAA Simulation for Autonomous Vehicles
Using the Real World is better than Proper Simulation for Autonomous Vehicle Development - NONSENSE
How Driverless Vehicle Makers Should Prove their Technology Works https://medium.com/@imispgh/how-driverless-vehicle-makers-should-prove-their-technology-works-2131f52b4c72
The Hype of Geofencing for Autonomous Vehicles