1. A warning signal generation system comprising: a selector to select between different modes of movement for a vehicle, the different modes of movement including at least a forward position to enable the vehicle to move in a forward direction and a rearward mode to enable the vehicle to move in a rearward direction; a detector to determine which of the different modes of movement has been selected via the selector and to produce an output indicative of that mode of movement; and a signal generator including an input to receive the output indicative of the vehicle mode of movement from the detector, the signal generator to generate a selected signal based on the received output indicative of the mode of movement of the vehicle, the selected signal to represent a warning zone proximate the vehicle based on a direction of movement of the vehicle indicated by the detected mode of movement of the vehicle, the signal generator to change a direction of the selected signal based on a change in the mode of movement detected by the detector, and the signal generator to modify a size and a shape of the warning zone based on a speed of the vehicle, the selected signal to communicate with a device separate from the vehicle and within the warning zone.