A steering lock that reduces the force required to disengage a lock bar from a steering shaft without affecting the antitheft effect of the steering lock. According to the invention, the costs of the device may be reduced and the flexibility increased, whereby the transport unit may at least partly be introduced into the transport cargo hold. A predicted value for the at least one entity at a given time obtained by means of the prediction model is compared with an aging threshold. The invention may be mounted onto a wall fixture, attached directly to a support surface or set on a support stand. The phase mismatches can be detected using the signals obtained by removing high frequency components of output of a multiplier by a low pass filter, the output being the product of the in-phase signals of which low frequency components are removed by a first high pass filter by the quadrature signals of which low frequency components are removed by a second high pass filter.