Originally Posted by
Odin
The radar that ACC uses is based on Doppler chirping radar. A characteristic of all Doppler radars is that they can only 'see' other objects when it has relative motion. Stationary objects are effectively invisible to Doppler. So it wouldn't have mattered if lanes were changed into the path of a stopped car, a brick wall, or a fallen roadside sign - they'd all be 'invisible' to the ACC's radar.
For a radar to detect a stopped car, and further discriminate against other harmless stationary roadside fixtures like armco barriers etc. would take some serious computing horsepower and a considerably more advanced radar to reliably achieve.
Yeah those of us who have read and found that out know but most arent aware and therefore think its a fault The guy whose car stops because driveway probably slopes and it sees the perceived upslope of the road is stopping because the rear traffic alert is activated
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