10-10-2023, 08:15 AM | #1 |
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Question about adaptive cruise and brake lights
Weird question...Does anyone know if the brake lights illuminate when adaptive cruise is slowing you down in traffic or maintaining distance?
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10-10-2023, 08:30 AM | #2 |
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By design, if the brakes are applied to slow the car down, the rear brake lights should illuminate. If the car is only using engine compression to slow the car down, then no...the brake lights do not illuminate.
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10-10-2023, 08:41 AM | #3 |
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Qsilver7
Thanks! Is it safe to assume the vehicle is not applying its own brakes in traffic? Rather, it is using engine compression to slow the vehicle down/maintain distance? Thus, no brake lights. |
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10-10-2023, 08:45 AM | #4 |
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Depends on the traffic conditions. Afaik it applies the brakes more often than not to maintain the set distance.
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10-10-2023, 08:54 AM | #5 | |
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The question remains, "Do the brake lights illuminate when adaptive cruise slows you down?". avi66 comes closer with an answer, but even they aren't sure. Any experts?
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10-10-2023, 09:22 AM | #6 | |
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Adaptive cruise control does both...it may let up on the throttle...or it may apply the brakes. Depending on which method it uses to slow the car down...relates to if the brake lights come on or not. If an "expert" does an experiment and reports back...I'm pretty sure that's what the outcome will be. Throttle/engine compression to slow the vehicle down results in no brake lights. If the brakes are applied to slow the vehicle down...the brake lights will illuminate. Experts...please chime in with your results.
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10-10-2023, 09:25 AM | #7 |
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astrohip
Exactly! Thought it was just me. I guess I need to get around to testing in traffic with someone behind me. HA! The reason I am asking is because I have about a 25 mile commute on a busy interstate. I rely on the adaptive cruise quite often and I DON'T want to be that guy applying his brakes incessantly when slowing down or maintaining distance. If I knew for sure the brake lights were coming on, I would be less inclined to use cruise on heavier traffic days. (Disclaimer for future posters: I don't need a lecture about using adaptive cruise on busy highways. Thanks) |
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10-10-2023, 10:09 AM | #8 | |
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10-10-2023, 10:21 AM | #9 |
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The simple answer is, the lights come on if the car applies the breaks. On rainy days, I've been able to see my brake lights in the window of the car behind me. From a light perspective, it behaves exactly like it would if you were manually driving.
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10-10-2023, 10:23 AM | #10 | |
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Also how hard/aggressive it accelerates etc is influenced by driver experience mode. I use every time I’m on the motorway, so thousands of miles usage. What do you do when driving manually if a car cut you up very close ? Last edited by avi66; 10-10-2023 at 10:29 AM.. |
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10-10-2023, 10:28 AM | #11 | |
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Seriously, you’re worried about the brake lights coming on ? |
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10-10-2023, 02:12 PM | #12 |
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Yes they do. I saw mine reflecting on the car behind the other day in low light levels.
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10-10-2023, 05:38 PM | #13 | |
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10-11-2023, 08:17 AM | #14 | |
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10-11-2023, 08:45 AM | #15 |
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Thank you for more information. Your first response didn't say what you said above. Now that I know ACC does both, it makes more sense.
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10-11-2023, 10:03 AM | #17 |
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It is as Qsilver7 says as I've experienced this many times at night on unlit highways. It's it's using the brakes to slow you down, the lights come on. If it's just letting off on the throttle, then no lights. I've wondered the same in the past only to witness it myself.
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10-11-2023, 10:11 AM | #18 | |
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10-11-2023, 04:57 PM | #19 |
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From what I can tell, it's trying to maintain the size of the gap between you and the car in front of you, so if the car in front of you is slowing down gradually, it will just ease off. However, if they slow down quicker, and the gap is going to get smaller than what you set at a faster rate, ACC would react more urgently and use the brakes to try to maintain that gap. So, I totally think from my experience is that it depends on what it needs to do to maintain the gap in front of you.
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10-11-2023, 05:13 PM | #20 | |
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10-11-2023, 08:24 PM | #21 | |
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10-11-2023, 10:39 PM | #22 | |
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