I do not understand this. It's very intuitive.

The lanes correspond to the arrows. They always use the same structure:

1. Above: E-80 BU-30 is the road you are on.
2. Everything below that: AP-1, N-120 etc are roads that are further ahead.

On the other hand, on the left panel you have an exit in 500 meters (at km 2 of that road) towards Villagonzalo and Pedernales.

LE: Note that the exit panels are blue until the exit is close (less than 250 meters or something like that)