This from http://www.ciclismointernacional.com/tour-de-france-2015-stage-4-preview/
Sectors 6 through to 1 follow in a space of 33km. If you get dropped, there isn’t much time to rejoin. The hardest section is number 2. The cobbles are rough and it was given a 4 star rating in Paris-Roubaix. We have 3 sectors that featured in the 2015 Hell of the North: Quievy, Python and Maugre. They were given 4, 2 and 3 stars, respectively. This stage is not near the difficulty level of Paris-Roubaix, but the final 70km, will be difficult to control.
Sectors 6 through to 1 follow in a space of 33km. If you get dropped, there isn’t much time to rejoin. The hardest section is number 2. The cobbles are rough and it was given a 4 star rating in Paris-Roubaix. We have 3 sectors that featured in the 2015 Hell of the North: Quievy, Python and Maugre. They were given 4, 2 and 3 stars, respectively. This stage is not near the difficulty level of Paris-Roubaix, but the final 70km, will be difficult to control.