Script?

As my short film is only going to have one character for most of the scenes there isn't going to be much dialogue because I didn't want the character to break the fourth wall and I felt narration wouldn't fit in with my plot. It is possible that I could have a phone call with the main character so there is at least some dialogue at the start of the film but towards the end there will be some dialogue when the main character tries to prevent the car hitting someone. As there will be minimal dialogue I was thinking of using quite powerful soundtracks and close ups of the main protagonists to show emotion.