A system for monitoring a vehicle's compliance with one or more vehicle-use conditions for accessing a transport network, the system including: (a) an in-vehicle unit associated with a vehicle being monitored, the IVU including: a receiver for receiving positioning signals; a processor for processing a time-marked log using at least in part the positioning signals; a storage element for storing the time-marked log; and a first wireless communication element for communicating time marked data of the time-marked log to a Service Provider processing apparatus; and (b) at least one Service Provider processing apparatus, the SP processing apparatus including: a SP wireless communication element for receiving the time-marked data from one or more IVUs; a SP processor for processing the time-marked data, the SP processor adapted to compare the time-marked data from the time-marked log of a vehicle with one or more vehicle-use conditions that are specific to that vehicle, and to generate a non-compliance report where the comparison indicates that non-compliant activity associated with the one or more vehicle use conditions has occurred; and a SP storage element for storing non-compliance reports and relevant time-marked data; wherein the one or more vehicle-use conditions monitored for compliance are specific to the vehicle being monitored said conditions having been defined electronically in a datafile unique to that vehicle, and wherein the SP processing apparatus automatically and electronically communicates details of non-compliance reports to a third party. (a) an in-vehicle unit associated with a vehicle being monitored, the IVU including: a receiver for receiving positioning signals; a processor for processing a time-marked log using at least in part the positioning signals; a storage element for storing the time-marked log; and a first wireless communication element for communicating time marked data of the time-marked log to a Service Provider processing apparatus; and a receiver for receiving positioning signals; a processor for processing a time-marked log using at least in part the positioning signals; a storage element for storing the time-marked log; and a first wireless communication element for communicating time marked data of the time-marked log to a Service Provider processing apparatus; and (b) at least one Service Provider processing apparatus, the SP processing apparatus including: a SP wireless communication element for receiving the time-marked data from one or more IVUs; a SP processor for processing the time-marked data, the SP processor adapted to compare the time-marked data from the time-marked log of a vehicle with one or more vehicle-use conditions that are specific to that vehicle, and to generate a non-compliance report where the comparison indicates that non-compliant activity associated with the one or more vehicle use conditions has occurred; and a SP storage element for storing non-compliance reports and relevant time-marked data; wherein the one or more vehicle-use conditions monitored for compliance are specific to the vehicle being monitored said conditions having been defined electronically in a datafile unique to that vehicle, and wherein the SP processing apparatus automatically and electronically communicates details of non-compliance reports to a third party. a SP wireless communication element for receiving the time-marked data from one or more IVUs; a SP processor for processing the time-marked data, the SP processor adapted to compare the time-marked data from the time-marked log of a vehicle with one or more vehicle-use conditions that are specific to that vehicle, and to generate a non-compliance report where the comparison indicates that non-compliant activity associated with the one or more vehicle use conditions has occurred; and a SP storage element for storing non-compliance reports and relevant time-marked data; wherein the one or more vehicle-use conditions monitored for compliance are specific to the vehicle being monitored said conditions having been defined electronically in a datafile unique to that vehicle, and wherein the SP processing apparatus automatically and electronically communicates details of non-compliance reports to a third party.