Can someone explain how Traffic Jam Assist works

jammit · 06-19-2019, 06:05 AM

When using drive assist and it stops in traffic, sometimes the car will move forward automatically, and sometimes I need to tap the accelerator. What determines this behaviour?
Local dealer genius could only tell me it was not only time dependent.

TJ_BMW · 06-19-2019, 06:35 AM

I tested it out this morning, and I had to press the accelerator anytime the car stopped. It did auto-start the engine though. It isn't actually Traffic Jam Assist in Australia, just adaptive cruise with lane-keep.

russelldav · 06-19-2019, 07:19 AM

Quote:

Originally Posted by jammit

When using drive assist and it stops in traffic, sometimes the car will move forward automatically, and sometimes I need to tap the accelerator. What determines this behaviour?
Local dealer genius could only tell me it was not only time dependent.

It uses the driver attention camera on the instrument cluster to determine if you are paying attention and looking forward at traffic. If you are, the system will pull away automatically. If you're looking down or away from the traffic situation you get prompted to tap the accelerator.

TheHitchhiker · 06-19-2019, 09:01 AM

Quote:

Originally Posted by russelldav

It uses the driver attention camera on the instrument cluster to determine if you are paying attention and looking forward at traffic. If you are, the system will pull away automatically. If you're looking down or away from the traffic situation you get prompted to tap the accelerator.

+1. This is the same experience I have. It always accelerates automatically (even if engine is off from auto stop) when I am looking at the road. When I look at iDrive or checking out the surroundings it will blink and beep. Then I have to tap the accelerator. Safety feature for sure.

maczrool · 06-19-2019, 09:15 AM

In my experience, if you enable it while at a stop it will require that you press the accelerator, otherwise it goes on its own except as others have mentioned if not paying attention.

I’m not sure I understand the wisdom of bringing the vehicle to a complete stop in moving traffic if it determines you aren’t paying attention. That seems pretty unsafe. Seems like it should pull over too but I think it just warns you it’s going to stop and then does so in the lane with cars behind you.

06-19-2019, 06:05 AM	#1
jammit Private First Class 58 Rep 124 Posts Drives: X5 Join Date: Aug 2018 Location: melbourne iTrader: (0)	Can someone explain how Traffic Jam Assist works When using drive assist and it stops in traffic, sometimes the car will move forward automatically, and sometimes I need to tap the accelerator. What determines this behaviour? Local dealer genius could only tell me it was not only time dependent.
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06-19-2019, 06:35 AM	#2
TJ_BMW First Lieutenant 210 Rep 323 Posts Drives: BMW X5 G05 30d/BMW M5 F90 Comp Join Date: Mar 2019 Location: Melbourne, Australia iTrader: (0) Garage List 2020 BMW M5 F90 Com ... [0.00] 2019 BMW X5 xDrive30d [0.00]	I tested it out this morning, and I had to press the accelerator anytime the car stopped. It did auto-start the engine though. It isn't actually Traffic Jam Assist in Australia, just adaptive cruise with lane-keep. Last edited by TJ_BMW; 06-19-2019 at 06:42 AM..
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06-19-2019, 09:15 AM	#5
maczrool Captain 154 Rep 602 Posts Drives: 22 M50i Carbon Black Join Date: May 2019 Location: Memphis iTrader: (0)	In my experience, if you enable it while at a stop it will require that you press the accelerator, otherwise it goes on its own except as others have mentioned if not paying attention. I’m not sure I understand the wisdom of bringing the vehicle to a complete stop in moving traffic if it determines you aren’t paying attention. That seems pretty unsafe. Seems like it should pull over too but I think it just warns you it’s going to stop and then does so in the lane with cars behind you.
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