Welcome to Tesla Motors Club
Discuss Tesla's Model S, Model 3, Model X, Model Y, Cybertruck, Roadster and More.

MCU2 + HW3 Stop Light Control (UK)

Hi, I recently learned that upgrading my AP2.0 and MCU1 tesla model x to MCU2 will also give it HW3 btw I am in the UK

I am aware that having this upgrade means that the car CAN SEE traffic lights and stop signs

however if I DO NOT purchase the FULL SELF DRIVING package will it still stop at a red light? Or will it literally see the red light and go straight past it.
I would think that’s kind of stupid for a car to do if it was that smart in the first place so please can someone let me know.

Also after a while you end up feeling like you're repeatedly training the system to recognise traffic light controls, where the frequency of hesitant moments doesn't appear to reduce after many months.

It seems like all effort is focused at present is on FSD Beta 9.2 for the US.

Plus at present I find my own progressive regen/braking to be superior to that of the auto-stop on red lights.

Until junction and roundabout handling you'll also often find disabling AP results in the stopping force necessary before driving those manoeuvres yourself anyway.


Active Member
Feb 24, 2020
I have FSD. On mine, traffic light stops works on TACC alone as well as AP. It’s a bit pointless. It stops too far from the line.
in addition, if you are turning left or right, TACC moves off too fast to corner properly and AP won’t make a turn anyway.

About Us

Formed in 2006, Tesla Motors Club (TMC) was the first independent online Tesla community. Today it remains the largest and most dynamic community of Tesla enthusiasts. Learn more.

Do you value your experience at TMC? Consider becoming a Supporting Member of Tesla Motors Club. As a thank you for your contribution, you'll get nearly no ads in the Community and Groups sections. Additional perks are available depending on the level of contribution. Please visit the Account Upgrades page for more details.