SURFACE FRICTION DETERMINATION

A computer system is disclosed for determining a difference in surface friction between a first set of surface conditions and a second set of surface conditions, the computer system comprising processing circuitry configured to receive first data corresponding to a first set of surface conditions, the first data comprising a first slip angle for at least one wheel of a vehicle, receive second data corresponding to a second set of surface conditions, the second data comprising a second slip angle for at least one wheel of a vehicle, compare the first slip angle and the second slip angle, and upon there being a difference between the first slip angle and the second slip angle, determine that a surface friction associated with the first set of surface conditions is different from a surface friction associated with the second set of surface conditions, wherein a lateral acceleration of the vehicle associated with the first data is substantially the same as a lateral acceleration of the vehicle associated with the second data.