Abstract: A system for speed control of a vehicle (12) comprising a plurality of zones (16) defined within an area (12). Pairs of markings (18) are provided on surfaces in the area (12) on opposite sides of boundaries (17) of the zones (16). A sensor device (22) is provided on vehicles (12) travelling in the area (12) to obtain images from the surface adjacent the vehicle (12) and to detect the presence of the markings (18) within the image. A speed controller (26) is provided on the vehicle (12) to set a maximum vehicle speed based on information received from the sensor device (22). The sensor device (22) is configured such that on detection of the second marking (18) within the image within a predetermined time period of detection of the first marking (18), the sensor device (22) communicates with the speed controller (26) to set the maximum speed limit to that associated with the second marking (18) and on detection of no marking within the image, the maximum vehicle speed remains unchanged.