Engaging cruise control in stop and go traffic?

[stephane47]

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.

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[godfodder0901]

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.

Gen 1 here, but it should be the same. Under 20mph it won't engage unless you have a vehicle directly in front of you.

 

[gerrylum]

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

 

[TollKeeper]

Weird... Mine will engage any time I am on a named road, and I have a noted speed limit icon on my speedometer.

It will not engage if it does not know what max speed limit should be in my experience, in relationship to the stop-n-go traffic.

 

[RivAW]

It shouldn't have to be said but this is the difference between adaptive cruise control and the different levels of "autonomous driving". Cruise control generally (as well as adaptive cruise control) are meant to be used when cruising, at speed and not in stop/go traffic....that's why it doesn't even engage below 20 mpg. That said, once engaged, it will brake all the way to a stop and then continue when traffic allows (at least in the Gen 1 R1T) although it's a little too conservative in accelerating for me.

 

[godfodder0901]

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

....that's why it doesn't even engage below 20 mpg.

Oh yes it will.

 

[gerrylum]

Oh yes it will.

Well then mine must be defective because it definitely doesn't do this. I hit this traffic coming home every day and if I'm not paying attention and forget to engage ACC before I slow down below 20mph, I CANNOT engage ACC even though there's clearly a vehicle in front of me. Sometimes the traffic on here is so bad (backed up all the way between both intersections) that I will purposely hold back a little bit so I can speed up to 20 and quickly engage ACC. Dangerous, but it seems to be the only way to engage it.

EDIT: I see there is an additional requirement that lane lines be clearly visible which could be the issue. So we *should* say " Under 20mph it won't engage unless you have a vehicle directly in front of you AND lane lines are clearly visible". A lot of times it's not always the case that BOTH of these are true, especially for local roads around here.

 

[godfodder0901]

EDIT: I see there is an additional requirement that lane lines be clearly visible which could be the issue. So we *should* say " Under 20mph it won't engage unless you have a vehicle directly in front of you AND lane lines are clearly visible". A lot of times it's not always the case that BOTH of these are true, especially for local roads around here.

Maybe, but if that were the case then on that road I wouldn't expect it to engage above 20mph either.

 

[gerrylum]

Maybe, but if that were the case then on that road I wouldn't expect it to engage above 20mph either.

It definitely engages at 20+ no problem. I've never had a problem engaging at 20mph+ even without lane lines or a lead car.

 

[Riviot]

You have to have your foot off the brake to engage under 20mph. Either on the accelerator or not on it at all. I hover my foot over the brake in case of "sudden acceleration," which has never happened.

 

[VoodooRivian]

It shouldn't have to be said but this is the difference between adaptive cruise control and the different levels of "autonomous driving". Cruise control generally (as well as adaptive cruise control) are meant to be used when cruising, at speed and not in stop/go traffic....that's why it doesn't even engage below 20 mpg. That said, once engaged, it will brake all the way to a stop and then continue when traffic allows (at least in the Gen 1 R1T) although it's a little too conservative in accelerating for me.

My 2024 Ford Maverick has ACC and does stop n go in traffic. It does it very well too. Not as good as my M3 with FSD and the main difference is if you come to a full stop for about 3 seconds you either need to hit the button or gas to reengage ACC. There are lots of cars with stop n go ACC that do this and have been doing this for years.

I test drove an R1S and specifically tested the stop n go in traffic and it worked fine.

 

[Mathme]

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.

 

[gerrylum]

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.

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.

 

[FraserC]

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 use CC all the time for crawling in traffic, and all you have to do to get around the 20mph minimum to set is create a gap that lets you get to a tad more than 20, set it and there you have it.

 

[hgpayne]

I will often turn it on when stopped behind a vehicle at a stoplight. It auto sets to 20 but I dial it up to the speed limit so when traffic starts moving I accelerate along with it. If the light / stop is too long a message will pop up that adaptive cruise is suspended but just pressing on the accelerator reengages it. In stop and go maybe just wait for that stop part to turn it on. Gen1 R1T

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