Embodiments of the present invention provide a method (Figure 3 or 4, 300 or 400) of determining following vehicle information, comprising determining (Figure 3 or 4, 310 or 430), by one or more sensing means (Figure 2, 230 or 240), following vehicle information associated with any further vehicles (130, 140) following a vehicle (120), and transmitting (Figure 3 or 4, 320 or 450), from first communication means (Figure 2, 250) to second communication means (Figure 2, 250), a representation of the following vehicle information. The first vehicle (110) may use it’s forward facing sensors to establish the following vehicle information and communicate it to the object vehicle (120) or a stationary unit (150). The stationary unit may use the determined following vehicle information to inform a traffic control means (190), traffic light, to establish how long to keep the green light on.
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