Pick one scene (and this includes dialogue) and re-imagine it as a movie. And then either:
Rewrite it as a scene from a screenplay
– or –
Storyboard it, visually
In either case, highlight what the audience would see and hear. Describe the lighting, camera angles, shot sequence, set design, sound, etc. that would preserve the atmosphere and ambiance of the novel.
The scene you transpose to the screen does not need to be a long scene or an “exciting” scene. Ten lines of dialogue might be enough, or a few second of an encounter on the road.