Just saying, straight from the manual: “Adaptive Cruise Control may not detect stationary or slow-moving vehicles below 6 mph (10 km/h).”
In other words, if you see stopped traffic ahead of you, you need to take over and brake for yourself.
I’m not saying Lucid should not improve this situation. (That’s why they are currently building Traffic Jam assist.) I’m saying Lucid is telling you straight up ACC and Highway Assist are not designed to do what you are expecting here. So maybe don’t expect them to do that?
Might save you a heart attack or two.