particular application for which they are intended they are to be used within the wheel slip control system as a referent for determining other variables necessary to detect and correct wheel slip these parameters fall into two categories one of which is referred to as the detection parameters and the other referred to as the correction parameters each category of parameters can be further divided into two groups one of which is referred to as coupled and the other referred to as decoupled unlike prior art systems the present invention will thus allow a wheel slip control system to use parameters specifically optimized for the decoupled mode of operation as well as parameters specifically optimized for the coupled mode of operation regarding the detection parameters the wheel slip control system shall use them in its detection logic to determine whether a wheel axle combination exhibits slippage exceeding a critical level above which correction becomes necessary the wheel slip control system will use one group of detection parameters when the axles of the truck are operating in the decoupled mode of operation this group of parameters can be referred to as the decoupled detection parameters as represented by block 1 generally stated when the wheel axle combinations on the truck are being.