The itineraries represent varying degrees of difficulty, indicated by a number from 1 to 6. The degree indicated accounts for the terrain, the distances and the prevailing winds. The proposed degrees are provided only as indications.

1. Easy, flat route: presents little or no difficulty.
2. Relatively easy route: includes some small valleys.
3. Route of average difficulty: hilly, sometimes mountainous, against the wind and/or involving a longer distance.
4. More difficult route: hilly and mountainous, with relatively major differences in grade and/or fairly long distances.
5. Difficult route: requires major and repeated efforts.
6. Very difficult route: requires constant efforts, repeated climbs (mountain passes) and a high degree of training.