Engaging cruise control in stop and go traffic?

[godfodder0901]

100%. The ACC was definitely not built for stop and go. One of the reasons I really wanted to switch to OP Longitudinal on the Comma.

I actually feel the opposite. ACC, but more so HWA, are great in bumper-to-bumper traffic. I MUCH prefer Rivian Long to OP Long in these scenarios.

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[stephane47]

In CA, I've found that if traffic is moving slowly using the cruise in these situations is OK. It the traffic is truly stop and go (as in 0-10-5-20-5-0 MPH), the cruise then moves from blast off speed as the car in front speeds up to panic stop as traffic stops again. In those cases, I go old fashioned and turn the thing off as that much whiplash on the drivetrain, brakes, and people in the car just adds to the frustration. Oh yeah, since this is California, let's not forget about the idiot who also needs to cut you off with no turn signals as soon as there about 2/3 of a car length adding this pleasurable moment.

no thanks.

That's why, like in a Tesla, it's useful to be able to set it to lower speeds. There's no technological limitation here, it's just some wonk decided they didn't like cruise control below 20mph

 

[godfodder0901]

That's why, like in a Tesla, it's useful to be able to set it to lower speeds. There's no technological limitation here, it's just some wonk decided they didn't like cruise control below 20mph

As stated a few times, you CAN engage below 20mph.

 

[HaveBlue]

There were a few cases of people accidentally hitting the lever while stopped or going slow and the car accelerated to the speed limit. Rivian put some safety measures in after that.

 

[UnsungZero_OldTimeAdMan]

Short answer: It’s not a Tesla.

Long answer: It’s a new company that is risk adverse like any other new company. You would be conservative too if you had a new business. The last thing you need is to open yourself up to higher litigation risk and sink your young business and all your aspirations for the future. As such all of Rivian’s safety systems are calibrated to be conservative. Don’t like it? Go back to Tesla.

 

[stephane47]

There were a few cases of people accidentally hitting the lever while stopped or going slow and the car accelerated to the speed limit. Rivian put some safety measures in after that.

I solid safety measure would be to engage the CC at the 5mph speed that the car is moving when the driver engages it, and not some arbitrary 20mph number that is too fast for the conditions.

 

[stephane47]

Long answer: It’s a new company that is risk adverse like any other new company. You would be conservative too if you had a new business. The last thing you need is to open yourself up to higher litigation risk and sink your young business and all your aspirations for the future. As such all of Rivian’s safety systems are calibrated to be conservative. Don’t like it? Go back to Tesla.

I don't understand your point. You're saying that it's safe for the car to manage speed and not crash at 70mph, but not safe for the car to do that at lower speeds?

 

[JM.]

It won't engage under 20mph even with a vehicle in front of you.

It's either random when it won't, or is using a parameter I can't identify. I have definitely engaged it below 20, even stopped. There is a place near home where I very often set it while stopped. It sets itself to 20. But it often won't engage in slow traffic and I can't find the pattern.

The real answer to OP's question is that it's a shit system, and that's why we have Comma/OpenPilot.

 

[godfodder0901]

It's either random when it won't, or is using a parameter I can't identify. I have definitely engaged it below 20, even stopped. There is a place near home where I very often set it while stopped. It sets itself to 20. But it often won't engage in slow traffic and I can't find the pattern.

It's in the manual. Straight steering wheel, car in front, and visible road lines.

The real answer to OP's question is that it's a shit system, and that's why we have Comma/OpenPilot.

Except Comma won't engage if ACC won't...

 

[JM.]

It's in the manual. Straight steering wheel, car in front, and visible road lines.

Except Comma won't engage if ACC won't...

That's only with the old, early version that didn't have longitudinal control. Comma has been doing its own speed control for a while now.

EDIT to add: I have never had it fail to engage, so it doesn't SEEM to be a limitation with the new system, but I can't be totally sure.

 

[gerrylum]

That's only with the old, early version that didn't have longitudinal control. Comma has been doing its own speed control for a while now.

EDIT to add: I have never had it fail to engage, so it doesn't SEEM to be a limitation with the new system, but I can't be totally sure.

It still engages on ACC activation, so it can still be an issue depending on the situation. It does help knowing what the factors are to activate it below 20mph.

 

[JM.]

It still engages on ACC activation, so it can still be an issue depending on the situation. It does help knowing what the factors are to activate it below 20mph.

Because it's so much better than the built-in garbage, I also realized I'm FAR less likely to disengage it at all. So therefore, fewer chances for it to fail when I try to turn it on again. I'd say I corrected the Comma about 1/10th as often.

 

[godfodder0901]

Because it's so much better than the built-in garbage, I also realized I'm FAR less likely to disengage it at all. So therefore, fewer chances for it to fail when I try to turn it on again. I'd say I corrected the Comma about 1/10th as often.

Agreed. I get over 20 to engage it (unless there is a car in front of me) then leave it in MADS for the rest of the drive. However, the Comma system will only engage if ACC can, even with Open Pilot longitudinal.

 

[JamboF4]

Hi, I've had my R1S Gen2 for less than a week, and I struggle with getting the cruise control to work in stop and go traffic (0-15mph) , which is when I need it the most! Most of the time it won't engage, but once it a while it does (although at 20mph which is faster than I'm moving). If I engage it before traffic at higher speeds, then when I'm slower in traffic it works fine, but if I have to disengage it for any reason I'm basically screwed. Is there a better way to get it back on?

I don't understand the limitation, I've been driving a Tesla MY for years now and it engages at any speed, and can be set as low as 1 MPH.

Why?

 

[RivAW]

Oh yes it will.

In practice it does not (at least mine doesn't). Regardless, you shouldn't be using it in traffic at slow speed anyway....thats not what it's for.....but drive how you want....it's your prerogative.

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