If you dig in and watch the vehicles, it's clear that the next barrier is communication with other road users pedestrians, cyclists, drivers (and passengers).
Pedestrians don't know where the car is trying to go or when it will start or stop. Drivers get annoyed and brake check the vehicles. Drivers don't understand what the car is about to do next and drive erratically to get around it.
Pedestrians don't know where the car is trying to go or when it will start or stop. Drivers get annoyed and brake check the vehicles. Drivers don't understand what the car is about to do next and drive erratically to get around it.