Aspects of the present invention relate to a control system and method for a vehicle. The control system receives vision road traffic sign data from a vision subsystem of the vehicle, and receives navigation road traffic sign data from a navigation subsystem of the vehicle. The control system determines a characteristic of a detected road traffic sign, for example whether the detected road traffic sign is permanent or temporary by nature, or whether advance notification of the detected road traffic sign is needed, in the vicinity of the vehicle. The detected road traffic sign is included in at least one of the received vision road traffic sign data and the received navigation road traffic sign data. The control system determines whether to output an indication of the detected road traffic sign in dependence on the determined characteristic and in dependence on whether the detected road traffic sign is included in: the vision road traffic sign data; the navigation road traffic sign data; or, both the vision road traffic sign data and the navigation road traffic sign data.