A road freight transport security system for a vehicle, is described, which comprises a database; and a portable electronic device running a security application. The security application is configured to prompt a user to carry out a plurality of external security checks of the vehicle, provide a facility for the user to confirm completion of those checks, provide a facility for the user to associate one or more photographs, taken by the portable electronic device, with one or more of the checks, and to upload log data to the database, the log data indicating at least a date and time of completion of the checks. A sensor device is also provided, mounted within a freight area of the vehicle, having one or more sensors, and being operable to communicate an alert to the portable electronic device in the event that an anomaly is detected inside the freight area. In this way, real time detection of security breaches within a freight trailer or container may be achieved. The driver is not required to engage directly with an intruder, and is facilitated in reporting the crime and demonstrating that appropriate precautions had been taken. Accordingly, driver safety may be improved and freight thefts and or losses via contamination reduced.
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