Quote from danthebangerboy :

i think you are right maggot, i misread initially and then stuck with it, i see now, its a suggestion of transmission speed vs gps speed, i see, finally.

lol

Quote from geeman1 :

S2 already has speed at the wheels. S1 is an old version and there are not going be anymore updates to it. It was only updated so it can be played on modern computers and the changes to the master server.

This.
LFS currently measures speed calculated from the driven wheels/transmission. There was quite a discussion about it at the time it was implemented IIRC.

If you want 'GPS' speed, this value can be obtained using InSim.

And, as in real life, indicated speed is about 1.1x real/GPS speed

Quote from Degats :

..If you want 'GPS' speed, this value can be obtained using InSim.

yes on MCI Packet. but sure it sounds alot GPS style for me..

I'm pretty sure that speed in LFS measures on the wheels bcuz in the insim the speed wont goes up when i got stuck on the sand but in the speed0 the speed increases..so its really indicates that speed are measured in wheel