To learn about the importance of travel along the Hinterrhein, a multiday trekking route is signposted along the river from Thusis to Splügen, where it turns south to Splügen Pass, a historically important transit route to Italy. Nowadays there is no traffic across the Splügen pass in winter, whereas the route across its age-old rival, the San Bernardino Pass, was given a long road tunnel in 1967 that made it possible to keep the road open all year.