Might be a quick answer for someone?

I had my FL2 tracking checked as part of the CT (French MOT) here and was told the value was -8.5m/Km
They said the pass limit is +/-10m/Km but anything outside +/-8m/Km is worthy of note.

What the heck are these numbers in relation to 0.20degrees +/-0.20degrees, which is what I'm used to?

Is there a conversion chart somewhere (I've looked on the official French CT website).

The tyres look hunky dory by the way. Life is an uphill struggle. Only the gradient varies.

a strange unit for tracking.

Does it refer to how far the car would deviate from a straight line of 1km length ? Jules

Firstly I didn’t think wheel alignment was part of the Contrôle Technique……..
Thé alignment measurements would be in degrés/minutes……..except as Jules suggests it’s a measure of the rear axle misalignment…….if the garage is using a high tech Hunter Alignment system or similar than can measure this misalignment which will make the car ‘crab’…….i.e. pull to left or right…..if seriously misaligned…………10m/km seems a lot……
I would ask the question……has it passed the test….?
Altering the rear alignment could be a problem since spécial offset mounting bolts are used….& on an older car they could be rusted-up……
You say the tyres are wearing ok so I wouldn’t worry about it……if you have a pass….
Judging by the condition of most older cars requiring the French MOT…..it’s much less strict than UK despite being more costly…….! FL2 SD4 HSE Lux Auto MY 2012— current
D2 TD5 HSE Man MY 1999 470kmls….gone 2014 ….lovely engine..chassis rotten
D1 300TDI Man MY 1996 56kmls….gone 1999…D2 much better
Wife’s FL1 1.8P MY 2001 32kmls …gone 2007…has Mini since.

Yes Pete, wheel alignment is now part of the CT.

They drive the car over a metal plate in the floor (Remember Trakrite? Looks a bit like that to me!) and the figures appear on a TV screen, in red if a fail!

Yes, it passed the test. As the CT is only every 2 years here, I'll not worry, but I would like to understand how these "mystery french" measurements relate to what I'm used to.  Life is an uphill struggle. Only the gradient varies.

Ok Argos……test passed…..no worries but I have never seen or heard of these m/km measurements………can only imagine it’s a ‘ crabbing ‘ measurement……to check if the car is steering straight……
I’ll ask à friendly garagiste to explain…..
I have noticed Sunday afternoons in a French town quite a lot of cars ‘crab’ a bit after Sunday lunch….!
………….
Bon week-end…..Pete FL2 SD4 HSE Lux Auto MY 2012— current
D2 TD5 HSE Man MY 1999 470kmls….gone 2014 ….lovely engine..chassis rotten
D1 300TDI Man MY 1996 56kmls….gone 1999…D2 much better
Wife’s FL1 1.8P MY 2001 32kmls …gone 2007…has Mini since.