J248

You need to have travel assist turned on. When on this screen use the scroll wheel to turn on travel assist. It will show up to 3 lanes depending on the road you are on (it doesn’t always show multi lanes) and will show vehicles in other lanes like your image.

It does depend on how you drive. On the daily commute - 15 miles on B roads and through villages I get 33-36 on average. Never had less than 40 on a motorway trip, generally around 43-44, and had as much as 48 on a long steady drive, but if you boot it these figures can drop quickly.

If you go to vehicle settings > assist systems and press the > next to the Speed warning (to the right of the toggle) you get another screen where can turn off “Info sound when changing the permitted maximum speed”