1. A method for provisional determination of a mass of a vehicle ( 1 ) on initialization, in which the vehicle ( 1 ) comprises a control unit ( 2 ) which, on a basis of dynamic movement data of the vehicle ( 1 ), determines a current vehicle mass value, and the control unit storing a last dynamically determined vehicle mass value in a data memory ( 12 ) when the control unit ( 2 ) is de-initialized, and either on or immediately after the initialization of the control unit ( 2 ), the control unit ( 2 ) reads in the last-determined dynamic vehicle mass value stored in the data memory, the method comprising the steps of: storing the last dynamically determined vehicle mass value in the data memory ( 12 ) when the control unit ( 2 ) is being de-initialized; determining an axle load of at least one rear axle of the vehicle ( 1 ), with the control unit ( 12 ), using a static method by reading in the last dynamically determined vehicle mass value, that correlates with the axle load of the at least one rear axle, either on or immediately after the initialization of the control unit ( 2 ); determining a statically determined vehicle mass value on a basis of the last dynamically determined vehicle mass value; comparing the statically determined vehicle mass value with the last dynamically determined vehicle mass value; adopting the statically determined vehicle mass value as the relevant vehicle mass value, if the statically determined vehicle mass value differs by more than a predetermined tolerance range from the last dynamically determined mass value; and defining the relevant vehicle mass value as the last dynamically determined vehicle mass value, if the statically determined vehicle mass value is within the predetermined tolerance range.