Climb to Coll de Pradell from the C-16 turnoff near Guardiola de Berguedà.
The first section runs along the B-400 highway and is very flat. It is by far the busiest section, especially on holidays, weekends, or vacation periods. The road has no shoulder and the asphalt is in perfect condition.
The second section begins when you take the detour to the left onto the B-401 highway toward the village of Vallcebre. The road widens and the shoulder appears. This section has an initial uphill section and a subsequent descent to Vallcebre.
The third section is very tough and begins in the village of Vallcebre itself. It consists of approximately 3 km of very steep and constant gradients above 12% until you reach a rest stop.
The fourth section is literally a savagery. Take the road to the left and face the first winding section above 10%. After a brief rest, the famous concrete ramp at 23% appears. You have to hang on tight. From here to the top, it's 2 km where you only see the road. If you stop to take a break, you'll see the mining train and the beautiful views of the valley behind you.