[sjducb]

Emergency braking is much harder at freeway speeds.

At 35mph you can have something (radar/cameras) look a few meters ahead, then if there is a stationary obstacle you slam on the brakes.

At 60 that doesn’t work because braking distances are much longer. There might be an obstacle directly ahead of you on the pavement, but you won’t hit it because the car will turn with the road. This means that your emergency braking system needs to be aware of the steering, the road layout, and the expected route.