The typical codes and conventions of film trailers are key moments from the film which are not necessarily placed in the same order as the film, these scenes do not give away the actual plot of the film or otherwise they will be criticised for giving away too much details of the film.
Usually the names of the main stars are seen early in the trailer as this tells the audience who they can expect to see in the film.
Most times the names of the director/producer are usually included with phrases such as 'From the director/makers of…' This will make the audience interested even more in watching the film as if the film the director/Maker last film was a success, this will boost the amount of people who will watch the next film in project.
Also, powerful voice-overs are used to draw the attention of the audience to the key points in the film.
The text on the screen also outlines important information about the film, which includes the main stars, the release date, the title of the film & the directors/producers.
Music is also used in trailers to give the audience a sense of what type of genre the film will be, the style and in some cases the plot of the film, loud bangs are usually associated with action films, while soft, slow romantic movies are usually associated with romance films.
The target audience for this film would usually be targeted at males as the 'unstoppable' is an action film, and most action films are targeted for a more male audience. Females would usually go to wash if they find such big stars like Denzel Washington & Chris Pine attractive or are just fans of the two. The age range this film is generally targeted at people in their late teens to maybe even late twenties or older.
The genre of the film is represented through the trailer as there is a lot of 'crashes' & 'Booms' and the way the storyline is set you can tell the film is an action pack film.
I get an idea from the trailer & the posters that the film will definitely include a train, as the train is shown throughout the trailer and is shown in the poster, also it is shown that Chris pine & Denzel Washington will be the two main characters of the film as also like the film they are seen throughout the trailer & is shown in the film poster, this will definitely make the film more desirable to watch a bit of the plot is shown and obviously the audience want to know what happened next and how the solution was solved.
The advantages of using an internet trailer to promote a film over using a poster campaign are that most people use the internet a lot these days so this will definitely come to their attention.