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I have my forward collision warning system (FCWS) set to "Early" which should give me the earliest warning possible. A few days ago I had to brake vigurously but FCWS gave me no warning. AFTER I braked the system showed a red car in my HUD and instrument console with no attempt to brake for me and avoid a potential accident. There's also no audible warning which is crucial if somebody is distracted away from looking up front. I mean, if I see the red car in the HUD I should be also able to see the car in front of me!

My expectation was for the FCWS to warn me audibly and visibly and automativally brake for me in case there was no action from the driver after the warnings had been issued. Are my expectations incorrect?