[sjcoles]

Has to do with the limitations of radar. Radar will fail >40mph for stopped vehicles or detect them too late to stop. Honda and Tesla are working to remove radars and go vision only for speed control.

If you have a car with a AEB or CMBS (automatic emergency braking, crash mitigation braking system) the owners manual has a ton of fine print about it only making crashes less severe, not preventing them outright.

[t0mas88]

The detection range for radar is more than 200m, you can stop from speeds above 100mph in that distance. And the radar sensor automatically includes relative speed information on the target (doppler shift) which vision doesn't so it's easier to figure out whether something is stationary or not. So I don't believe this "vision only will fix it all" story.