During the International Transport Forum in Leipzig, transport ministers of the Alpine countries decided to continue the study on a differentiated toll system for crossing the Alps. This group of countries, known as the ‘Zurich Follow-Up’ is working on a project of French origin named Toll Plus which proposes to set differentiated toll levels according to three criteria: maximum mass and number of axles, the level of polluting emissions, and the time of day.

A report made public in September 2011 put figures to the impact of such a complementary toll system for the four main trans-Alpine routes: 73 EUR for the Mont-Blanc crossing, 78 EUR for the Gothard, 89 EUR for the Fréjus and 125 EUR for the Brenner.