The use of headlights as a source of lighting can be used to convey different messages. They are often used in scenes such as car chases to intensify the danger of the scene. Also this adds to the sense of being followed, a car is a fist moving vehicle they could be harmful to someone in their path as well as taking someone somewhere. They are a familiar aspect of all thriller films as they are a sign of darkness which means characters may be reliant on this source of light to see. Furthermore the use of an urban toking location with cars on a busy motorway or dual carriage way with shallow focus could be used to silhouette a character. There is also the opportunity to change the colour of headlights for effect using stickers. Different colours can cannot different things which can result in a change of atmosphere, considering the genre of out film is thriller this may take away from the aspect a realness in the trailer.