HI.

I think that when you take a car on a track, your personnal record on the track with the car should be written somewhere on the screen. It would be simpler. (I have to go on LFS world to see my records but there is may be a command).

Thanks, bye.

I think the commands you are looking for are standard keys in the LFS controls section since a long time
press CTRL+F7
or type in the game when you are online /w pb for your personal best
or /w wr for the world records.

/w laps works too.
but the ones posted previous are the most common

Sorry for the question and thanks for helping

Type: /w ?

That gives you a full list of in-game LFSWorld commands.