A roadbook is read in order. Each instruction is tied to distance, and that distance tells you when to expect the next decision. Before worrying about every symbol, get comfortable with the idea that the roadbook is a timed and measured sequence of information.
If you jump ahead too far or react to a similar-looking junction at the wrong distance, the route can unravel quickly. Distance discipline is one of the first habits to build.
In practice, that means training your eyes to move between the distance, the tulip and the notes without getting stuck on one detail. A simple instruction can become difficult when you are tired, riding in dust, or trying to recover from a mistake.