What does the green line in the middle of the tire represent in the attached picture?

Direction of the force aplied to the tyre by the ground?

is there an explanation anywhere to get info on that display?

Quote from March Hare :

Direction of the force aplied to the tyre by the ground?

I'm not sure what, that's why I'm asking.

Quote from OmniMoAK :

is there an explanation anywhere to get info on that display?

I looked in the LFS wiki manual and used the forum search but didn't come up with anything.

Pure guess but camber thrust maybe it does change when you alter camber adjustment and it does move arround a little in replays...

Yeah I thought it had something to do with the camber as well but it's only a guess.

It's a good question, actually. LFSWiki has no mention of it, and although I noticed it, I don't pay any attention to it.

just a guess, but i was thinking that it was for instant center of some kind
if you look at a car with trailing arms (uf1 for example) they are always parallel, which makes sense because the wheels move only straight up and down.

now that i think about it, i think that the lines are tangent to the curve the suspension will take throughout its travel.

draw a perpindicular line to each one and thats your IC

Oh it makes perfect sense! thanks zeb maybe someone not lazy enough should put that in the wiki manual.