In my L322, when using the navigation, by whatever method, it knew when there was heavy traffic ahead, up came a warning on the screen with an option to reroute. Which was jolly handy.

On my L405, I get no such warnings. And end up sitting in traffic.

Is this an option I can enable, or can be enabled? Or do I maybe need to have an internet-enabled SIM card in it for this? I didn't on the old one - not sure how it knew. Witchcraft perhaps. 2017 4.4 SDV8 Autobiography in black
2018 D300 SE Velar in champagne
Spiffing wheel centre caps, L322 sill repair panels, etc

SIM card required as far as I’m aware. I have one that doesn’t allow roaming, and the system gave me an indication i wouldn’t get traffic info as soon as I left the country. 2018 P400e AB LWB

Assuming yours has the InControl Touch Pro (10 inch touchscreen) then to get traffic updates you need both a data SIM and a valid map subscription.

Set up an account here

With a map subscription you get monthly updates, for which you need a 64GB USB stick - a fast internet connection is useful the updates are around 36GB each.

Thanks. What system did the L322 have that made it free and included I wonder? 2017 4.4 SDV8 Autobiography in black
2018 D300 SE Velar in champagne
Spiffing wheel centre caps, L322 sill repair panels, etc

Would have used TMC (Traffic Message Channel), which had a separate receiver module.

Wikipedia link